Merge tag 'usb-serial-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next

Johan writes:

USB-serial updates for v4.12-rc1

Here are the USB-serial updates for 4.12, including:

 - support for devices with up to 16 ports (e.g. some Moxa devices)

 - support for endpoint sanity checks in core, which allows for code sharing
   and avoids allocating resources for rejected interfaces

 - support for endpoint-port remapping, which allows some driver hacks to
   be removed as well as omninet to use the generic write implementation

 - removal of an obsolete tty open-race workaround which prevented a
   port from being opened immediately after having been registered

 - generic-driver support for interfaces with just a bulk-in endpoint

 - improved ftdi_sio event-char and latency-timer handling

 - improved ftdi_sio support for some broken BM chips

Included are also various clean ups and a new ftdi_sio device id.

All have been in linux-next with no reported issues.

Signed-off-by: Johan Hovold <johan@kernel.org>

30 files changed, 517 insertions, 923 deletions

diff --git a/drivers/usb/serial/aircable.c b/drivers/usb/serial/aircable.c
index 80a9845..569c220 100644
--- a/drivers/usb/serial/aircable.c
+++ b/drivers/usb/serial/aircable.c
@@ -29,12 +29,6 @@
  * is any other control code, I will simply check for the first
  * one.
  *
- * The driver registers himself with the USB-serial core and the USB Core. I had
- * to implement a probe function against USB-serial, because other way, the
- * driver was attaching himself to both interfaces. I have tried with different
- * configurations of usb_serial_driver with out exit, only the probe function
- * could handle this correctly.
- *
  * I have taken some info from a Greg Kroah-Hartman article:
  * http://www.linuxjournal.com/article/6573
  * And from Linux Device Driver Kit CD, which is a great work, the authors taken
@@ -93,30 +87,17 @@ static int aircable_prepare_write_buffer(struct usb_serial_port *port,
 	return count + HCI_HEADER_LENGTH;
 }
 
-static int aircable_probe(struct usb_serial *serial,
-			  const struct usb_device_id *id)
+static int aircable_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
-	struct usb_host_interface *iface_desc = serial->interface->
-								cur_altsetting;
-	struct usb_endpoint_descriptor *endpoint;
-	int num_bulk_out = 0;
-	int i;
-
-	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
-		endpoint = &iface_desc->endpoint[i].desc;
-		if (usb_endpoint_is_bulk_out(endpoint)) {
-			dev_dbg(&serial->dev->dev,
-				"found bulk out on endpoint %d\n", i);
-			++num_bulk_out;
-		}
-	}
-
-	if (num_bulk_out == 0) {
-		dev_dbg(&serial->dev->dev, "Invalid interface, discarding\n");
+	/* Ignore the first interface, which has no bulk endpoints. */
+	if (epds->num_bulk_out == 0) {
+		dev_dbg(&serial->interface->dev,
+			"ignoring interface with no bulk-out endpoints\n");
 		return -ENODEV;
 	}
 
-	return 0;
+	return 1;
 }
 
 static int aircable_process_packet(struct usb_serial_port *port,
@@ -164,9 +145,8 @@ static struct usb_serial_driver aircable_device = {
 		.name =		"aircable",
 	},
 	.id_table = 		id_table,
-	.num_ports =		1,
 	.bulk_out_size =	HCI_COMPLETE_FRAME,
-	.probe =		aircable_probe,
+	.calc_num_ports =	aircable_calc_num_ports,
 	.process_read_urb =	aircable_process_read_urb,
 	.prepare_write_buffer =	aircable_prepare_write_buffer,
 	.throttle =		usb_serial_generic_throttle,
diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c
index 2779e59..0adbd38 100644
--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -122,19 +122,6 @@ static inline int calc_divisor(int bps)
 	return (12000000 + 2*bps) / (4*bps);
 }
 
-static int ark3116_attach(struct usb_serial *serial)
-{
-	/* make sure we have our end-points */
-	if (serial->num_bulk_in == 0 ||
-			serial->num_bulk_out == 0 ||
-			serial->num_interrupt_in == 0) {
-		dev_err(&serial->interface->dev, "missing endpoint\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int ark3116_port_probe(struct usb_serial_port *port)
 {
 	struct usb_serial *serial = port->serial;
@@ -671,7 +658,9 @@ static struct usb_serial_driver ark3116_device = {
 	},
 	.id_table =		id_table,
 	.num_ports =		1,
-	.attach =		ark3116_attach,
+	.num_bulk_in =		1,
+	.num_bulk_out =		1,
+	.num_interrupt_in =	1,
 	.port_probe =		ark3116_port_probe,
 	.port_remove =		ark3116_port_remove,
 	.set_termios =		ark3116_set_termios,
diff --git a/drivers/usb/serial/cyberjack.c b/drivers/usb/serial/cyberjack.c
index 80260b0..47fbd9f 100644
--- a/drivers/usb/serial/cyberjack.c
+++ b/drivers/usb/serial/cyberjack.c
@@ -50,7 +50,6 @@
 #define CYBERJACK_PRODUCT_ID	0x0100
 
 /* Function prototypes */
-static int cyberjack_attach(struct usb_serial *serial);
 static int cyberjack_port_probe(struct usb_serial_port *port);
 static int cyberjack_port_remove(struct usb_serial_port *port);
 static int  cyberjack_open(struct tty_struct *tty,
@@ -78,7 +77,7 @@ static struct usb_serial_driver cyberjack_device = {
 	.description =		"Reiner SCT Cyberjack USB card reader",
 	.id_table =		id_table,
 	.num_ports =		1,
-	.attach =		cyberjack_attach,
+	.num_bulk_out =		1,
 	.port_probe =		cyberjack_port_probe,
 	.port_remove =		cyberjack_port_remove,
 	.open =			cyberjack_open,
@@ -102,14 +101,6 @@ struct cyberjack_private {
 	short		wrsent;		/* Data already sent */
 };
 
-static int cyberjack_attach(struct usb_serial *serial)
-{
-	if (serial->num_bulk_out < serial->num_ports)
-		return -ENODEV;
-
-	return 0;
-}
-
 static int cyberjack_port_probe(struct usb_serial_port *port)
 {
 	struct cyberjack_private *priv;
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 6537d3c..2ce39af 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -273,6 +273,8 @@ static struct usb_serial_driver digi_acceleport_2_device = {
 	.description =			"Digi 2 port USB adapter",
 	.id_table =			id_table_2,
 	.num_ports =			3,
+	.num_bulk_in =			4,
+	.num_bulk_out =			4,
 	.open =				digi_open,
 	.close =			digi_close,
 	.dtr_rts =			digi_dtr_rts,
@@ -302,6 +304,8 @@ static struct usb_serial_driver digi_acceleport_4_device = {
 	.description =			"Digi 4 port USB adapter",
 	.id_table =			id_table_4,
 	.num_ports =			4,
+	.num_bulk_in =			5,
+	.num_bulk_out =			5,
 	.open =				digi_open,
 	.close =			digi_close,
 	.write =			digi_write,
@@ -1251,27 +1255,8 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
 
 static int digi_startup(struct usb_serial *serial)
 {
-	struct device *dev = &serial->interface->dev;
 	struct digi_serial *serial_priv;
 	int ret;
-	int i;
-
-	/* check whether the device has the expected number of endpoints */
-	if (serial->num_port_pointers < serial->type->num_ports + 1) {
-		dev_err(dev, "OOB endpoints missing\n");
-		return -ENODEV;
-	}
-
-	for (i = 0; i < serial->type->num_ports + 1 ; i++) {
-		if (!serial->port[i]->read_urb) {
-			dev_err(dev, "bulk-in endpoint missing\n");
-			return -ENODEV;
-		}
-		if (!serial->port[i]->write_urb) {
-			dev_err(dev, "bulk-out endpoint missing\n");
-			return -ENODEV;
-		}
-	}
 
 	serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 	if (!serial_priv)
diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 22f23a4..3d616a2 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -611,20 +611,30 @@ static int f81534_find_config_idx(struct usb_serial *serial, u8 *index)
  * The f81534_calc_num_ports() will run to "new style" with checking
  * F81534_PORT_UNAVAILABLE section.
  */
-static int f81534_calc_num_ports(struct usb_serial *serial)
+static int f81534_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
+	struct device *dev = &serial->interface->dev;
+	int size_bulk_in = usb_endpoint_maxp(epds->bulk_in[0]);
+	int size_bulk_out = usb_endpoint_maxp(epds->bulk_out[0]);
 	u8 setting[F81534_CUSTOM_DATA_SIZE];
 	u8 setting_idx;
 	u8 num_port = 0;
 	int status;
 	size_t i;
 
+	if (size_bulk_out != F81534_WRITE_BUFFER_SIZE ||
+			size_bulk_in != F81534_MAX_RECEIVE_BLOCK_SIZE) {
+		dev_err(dev, "unsupported endpoint max packet size\n");
+		return -ENODEV;
+	}
+
 	/* Check had custom setting */
 	status = f81534_find_config_idx(serial, &setting_idx);
 	if (status) {
 		dev_err(&serial->interface->dev, "%s: find idx failed: %d\n",
 				__func__, status);
-		return 0;
+		return status;
 	}
 
 	/*
@@ -640,7 +650,7 @@ static int f81534_calc_num_ports(struct usb_serial *serial)
 			dev_err(&serial->interface->dev,
 					"%s: get custom data failed: %d\n",
 					__func__, status);
-			return 0;
+			return status;
 		}
 
 		dev_dbg(&serial->interface->dev,
@@ -656,7 +666,7 @@ static int f81534_calc_num_ports(struct usb_serial *serial)
 			dev_err(&serial->interface->dev,
 					"%s: read failed: %d\n", __func__,
 					status);
-			return 0;
+			return status;
 		}
 
 		dev_dbg(&serial->interface->dev, "%s: read default config\n",
@@ -671,12 +681,24 @@ static int f81534_calc_num_ports(struct usb_serial *serial)
 		++num_port;
 	}
 
-	if (num_port)
-		return num_port;
+	if (!num_port) {
+		dev_warn(&serial->interface->dev,
+			"no config found, assuming 4 ports\n");
+		num_port = 4;		/* Nothing found, oldest version IC */
+	}
+
+	/*
+	 * Setup bulk-out endpoint multiplexing. All ports share the same
+	 * bulk-out endpoint.
+	 */
+	BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < F81534_NUM_PORT);
+
+	for (i = 1; i < num_port; ++i)
+		epds->bulk_out[i] = epds->bulk_out[0];
 
-	dev_warn(&serial->interface->dev, "%s: Read Failed. default 4 ports\n",
-			__func__);
-	return 4;		/* Nothing found, oldest version IC */
+	epds->num_bulk_out = num_port;
+
+	return num_port;
 }
 
 static void f81534_set_termios(struct tty_struct *tty,
@@ -1067,96 +1089,6 @@ static void f81534_write_usb_callback(struct urb *urb)
 	}
 }
 
-static int f81534_setup_ports(struct usb_serial *serial)
-{
-	struct usb_serial_port *port;
-	u8 port0_out_address;
-	int buffer_size;
-	size_t i;
-
-	/*
-	 * In our system architecture, we had 2 or 4 serial ports,
-	 * but only get 1 set of bulk in/out endpoints.
-	 *
-	 * The usb-serial subsystem will generate port 0 data,
-	 * but port 1/2/3 will not. It's will generate write URB and buffer
-	 * by following code and use the port0 read URB for read operation.
-	 */
-	for (i = 1; i < serial->num_ports; ++i) {
-		port0_out_address = serial->port[0]->bulk_out_endpointAddress;
-		buffer_size = serial->port[0]->bulk_out_size;
-		port = serial->port[i];
-
-		if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
-			return -ENOMEM;
-
-		port->bulk_out_size = buffer_size;
-		port->bulk_out_endpointAddress = port0_out_address;
-
-		port->write_urbs[0] = usb_alloc_urb(0, GFP_KERNEL);
-		if (!port->write_urbs[0])
-			return -ENOMEM;
-
-		port->bulk_out_buffers[0] = kzalloc(buffer_size, GFP_KERNEL);
-		if (!port->bulk_out_buffers[0])
-			return -ENOMEM;
-
-		usb_fill_bulk_urb(port->write_urbs[0], serial->dev,
-				usb_sndbulkpipe(serial->dev,
-					port0_out_address),
-				port->bulk_out_buffers[0], buffer_size,
-				serial->type->write_bulk_callback, port);
-
-		port->write_urb = port->write_urbs[0];
-		port->bulk_out_buffer = port->bulk_out_buffers[0];
-	}
-
-	return 0;
-}
-
-static int f81534_probe(struct usb_serial *serial,
-					const struct usb_device_id *id)
-{
-	struct usb_endpoint_descriptor *endpoint;
-	struct usb_host_interface *iface_desc;
-	struct device *dev;
-	int num_bulk_in = 0;
-	int num_bulk_out = 0;
-	int size_bulk_in = 0;
-	int size_bulk_out = 0;
-	int i;
-
-	dev = &serial->interface->dev;
-	iface_desc = serial->interface->cur_altsetting;
-
-	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
-		endpoint = &iface_desc->endpoint[i].desc;
-
-		if (usb_endpoint_is_bulk_in(endpoint)) {
-			++num_bulk_in;
-			size_bulk_in = usb_endpoint_maxp(endpoint);
-		}
-
-		if (usb_endpoint_is_bulk_out(endpoint)) {
-			++num_bulk_out;
-			size_bulk_out = usb_endpoint_maxp(endpoint);
-		}
-	}
-
-	if (num_bulk_in != 1 || num_bulk_out != 1) {
-		dev_err(dev, "expected endpoints not found\n");
-		return -ENODEV;
-	}
-
-	if (size_bulk_out != F81534_WRITE_BUFFER_SIZE ||
-			size_bulk_in != F81534_MAX_RECEIVE_BLOCK_SIZE) {
-		dev_err(dev, "unsupported endpoint max packet size\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int f81534_attach(struct usb_serial *serial)
 {
 	struct f81534_serial_private *serial_priv;
@@ -1173,10 +1105,6 @@ static int f81534_attach(struct usb_serial *serial)
 
 	mutex_init(&serial_priv->urb_mutex);
 
-	status = f81534_setup_ports(serial);
-	if (status)
-		return status;
-
 	/* Check had custom setting */
 	status = f81534_find_config_idx(serial, &serial_priv->setting_idx);
 	if (status) {
@@ -1380,12 +1308,13 @@ static struct usb_serial_driver f81534_device = {
 	},
 	.description =		DRIVER_DESC,
 	.id_table =		f81534_id_table,
+	.num_bulk_in =		1,
+	.num_bulk_out =		1,
 	.open =			f81534_open,
 	.close =		f81534_close,
 	.write =		f81534_write,
 	.tx_empty =		f81534_tx_empty,
 	.calc_num_ports =	f81534_calc_num_ports,
-	.probe =		f81534_probe,
 	.attach =		f81534_attach,
 	.port_probe =		f81534_port_probe,
 	.dtr_rts =		f81534_dtr_rts,
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index c540de1..d38780f 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -873,6 +873,7 @@ static const struct usb_device_id id_table_combined[] = {
 	{ USB_DEVICE_AND_INTERFACE_INFO(MICROCHIP_VID, MICROCHIP_USB_BOARD_PID,
 					USB_CLASS_VENDOR_SPEC,
 					USB_SUBCLASS_VENDOR_SPEC, 0x00) },
+	{ USB_DEVICE_INTERFACE_NUMBER(ACTEL_VID, MICROSEMI_ARROW_SF2PLUS_BOARD_PID, 2) },
 	{ USB_DEVICE(JETI_VID, JETI_SPC1201_PID) },
 	{ USB_DEVICE(MARVELL_VID, MARVELL_SHEEVAPLUG_PID),
 		.driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
@@ -1406,6 +1407,9 @@ static int write_latency_timer(struct usb_serial_port *port)
 	int rv;
 	int l = priv->latency;
 
+	if (priv->chip_type == SIO || priv->chip_type == FT8U232AM)
+		return -EINVAL;
+
 	if (priv->flags & ASYNC_LOW_LATENCY)
 		l = 1;
 
@@ -1422,7 +1426,7 @@ static int write_latency_timer(struct usb_serial_port *port)
 	return rv;
 }
 
-static int read_latency_timer(struct usb_serial_port *port)
+static int _read_latency_timer(struct usb_serial_port *port)
 {
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
 	struct usb_device *udev = port->serial->dev;
@@ -1440,11 +1444,10 @@ static int read_latency_timer(struct usb_serial_port *port)
 			     0, priv->interface,
 			     buf, 1, WDR_TIMEOUT);
 	if (rv < 1) {
-		dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
 		if (rv >= 0)
 			rv = -EIO;
 	} else {
-		priv->latency = buf[0];
+		rv = buf[0];
 	}
 
 	kfree(buf);
@@ -1452,6 +1455,25 @@ static int read_latency_timer(struct usb_serial_port *port)
 	return rv;
 }
 
+static int read_latency_timer(struct usb_serial_port *port)
+{
+	struct ftdi_private *priv = usb_get_serial_port_data(port);
+	int rv;
+
+	if (priv->chip_type == SIO || priv->chip_type == FT8U232AM)
+		return -EINVAL;
+
+	rv = _read_latency_timer(port);
+	if (rv < 0) {
+		dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
+		return rv;
+	}
+
+	priv->latency = rv;
+
+	return 0;
+}
+
 static int get_serial_info(struct usb_serial_port *port,
 				struct serial_struct __user *retinfo)
 {
@@ -1603,9 +1625,19 @@ static void ftdi_determine_type(struct usb_serial_port *port)
 		priv->baud_base = 12000000 / 16;
 	} else if (version < 0x400) {
 		/* Assume it's an FT8U232AM (or FT8U245AM) */
-		/* (It might be a BM because of the iSerialNumber bug,
-		 * but it will still work as an AM device.) */
 		priv->chip_type = FT8U232AM;
+		/*
+		 * It might be a BM type because of the iSerialNumber bug.
+		 * If iSerialNumber==0 and the latency timer is readable,
+		 * assume it is BM type.
+		 */
+		if (udev->descriptor.iSerialNumber == 0 &&
+				_read_latency_timer(port) >= 0) {
+			dev_dbg(&port->dev,
+				"%s: has latency timer so not an AM type\n",
+				__func__);
+			priv->chip_type = FT232BM;
+		}
 	} else if (version < 0x600) {
 		/* Assume it's an FT232BM (or FT245BM) */
 		priv->chip_type = FT232BM;
@@ -1685,9 +1717,12 @@ static ssize_t latency_timer_store(struct device *dev,
 {
 	struct usb_serial_port *port = to_usb_serial_port(dev);
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
-	int v = simple_strtoul(valbuf, NULL, 10);
+	u8 v;
 	int rv;
 
+	if (kstrtou8(valbuf, 10, &v))
+		return -EINVAL;
+
 	priv->latency = v;
 	rv = write_latency_timer(port);
 	if (rv < 0)
@@ -1704,10 +1739,13 @@ static ssize_t store_event_char(struct device *dev,
 	struct usb_serial_port *port = to_usb_serial_port(dev);
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
 	struct usb_device *udev = port->serial->dev;
-	int v = simple_strtoul(valbuf, NULL, 10);
+	unsigned int v;
 	int rv;
 
-	dev_dbg(&port->dev, "%s: setting event char = %i\n", __func__, v);
+	if (kstrtouint(valbuf, 0, &v) || v >= 0x200)
+		return -EINVAL;
+
+	dev_dbg(&port->dev, "%s: setting event char = 0x%03x\n", __func__, v);
 
 	rv = usb_control_msg(udev,
 			     usb_sndctrlpipe(udev, 0),
diff --git a/drivers/usb/serial/ftdi_sio_ids.h b/drivers/usb/serial/ftdi_sio_ids.h
index 48ee04c..71fb9e5 100644
--- a/drivers/usb/serial/ftdi_sio_ids.h
+++ b/drivers/usb/serial/ftdi_sio_ids.h
@@ -873,6 +873,12 @@
 #define	FIC_VID			0x1457
 #define	FIC_NEO1973_DEBUG_PID	0x5118
 
+/*
+ * Actel / Microsemi
+ */
+#define ACTEL_VID				0x1514
+#define MICROSEMI_ARROW_SF2PLUS_BOARD_PID	0x2008
+
 /* Olimex */
 #define OLIMEX_VID			0x15BA
 #define OLIMEX_ARM_USB_OCD_PID		0x0003
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 49ce2be..35cb8c0 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -37,13 +37,41 @@ MODULE_PARM_DESC(product, "User specified USB idProduct");
 
 static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
 
-struct usb_serial_driver usb_serial_generic_device = {
+static int usb_serial_generic_probe(struct usb_serial *serial,
+					const struct usb_device_id *id)
+{
+	struct device *dev = &serial->interface->dev;
+
+	dev_info(dev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
+	dev_info(dev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
+
+	return 0;
+}
+
+static int usb_serial_generic_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
+{
+	struct device *dev = &serial->interface->dev;
+	int num_ports;
+
+	num_ports = max(epds->num_bulk_in, epds->num_bulk_out);
+
+	if (num_ports == 0) {
+		dev_err(dev, "device has no bulk endpoints\n");
+		return -ENODEV;
+	}
+
+	return num_ports;
+}
+
+static struct usb_serial_driver usb_serial_generic_device = {
 	.driver = {
 		.owner =	THIS_MODULE,
 		.name =		"generic",
 	},
 	.id_table =		generic_device_ids,
-	.num_ports =		1,
+	.probe =		usb_serial_generic_probe,
+	.calc_num_ports =	usb_serial_generic_calc_num_ports,
 	.throttle =		usb_serial_generic_throttle,
 	.unthrottle =		usb_serial_generic_unthrottle,
 	.resume =		usb_serial_generic_resume,
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index bb7673e..bdf8bd8 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -1544,11 +1544,6 @@ static void edge_set_termios(struct tty_struct *tty,
 	struct usb_serial_port *port, struct ktermios *old_termios)
 {
 	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
-	unsigned int cflag;
-
-	cflag = tty->termios.c_cflag;
-	dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__, tty->termios.c_cflag, tty->termios.c_iflag);
-	dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__, old_termios->c_cflag, old_termios->c_iflag);
 
 	if (edge_port == NULL)
 		return;
@@ -2844,14 +2839,9 @@ static int edge_startup(struct usb_serial *serial)
 	bool interrupt_in_found;
 	bool bulk_in_found;
 	bool bulk_out_found;
-	static __u32 descriptor[3] = {	EDGE_COMPATIBILITY_MASK0,
-					EDGE_COMPATIBILITY_MASK1,
-					EDGE_COMPATIBILITY_MASK2 };
-
-	if (serial->num_bulk_in < 1 || serial->num_interrupt_in < 1) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
+	static const __u32 descriptor[3] = {	EDGE_COMPATIBILITY_MASK0,
+						EDGE_COMPATIBILITY_MASK1,
+						EDGE_COMPATIBILITY_MASK2 };
 
 	dev = serial->dev;
 
@@ -3120,6 +3110,9 @@ static struct usb_serial_driver edgeport_2port_device = {
 	.description		= "Edgeport 2 port adapter",
 	.id_table		= edgeport_2port_id_table,
 	.num_ports		= 2,
+	.num_bulk_in		= 1,
+	.num_bulk_out		= 1,
+	.num_interrupt_in	= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
@@ -3152,6 +3145,9 @@ static struct usb_serial_driver edgeport_4port_device = {
 	.description		= "Edgeport 4 port adapter",
 	.id_table		= edgeport_4port_id_table,
 	.num_ports		= 4,
+	.num_bulk_in		= 1,
+	.num_bulk_out		= 1,
+	.num_interrupt_in	= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
@@ -3184,6 +3180,9 @@ static struct usb_serial_driver edgeport_8port_device = {
 	.description		= "Edgeport 8 port adapter",
 	.id_table		= edgeport_8port_id_table,
 	.num_ports		= 8,
+	.num_bulk_in		= 1,
+	.num_bulk_out		= 1,
+	.num_interrupt_in	= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
@@ -3216,6 +3215,9 @@ static struct usb_serial_driver epic_device = {
 	.description		= "EPiC device",
 	.id_table		= Epic_port_id_table,
 	.num_ports		= 1,
+	.num_bulk_in		= 1,
+	.num_bulk_out		= 1,
+	.num_interrupt_in	= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index a76b95d..87798e6 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -1933,13 +1933,6 @@ static int edge_open(struct tty_struct *tty, struct usb_serial_port *port)
 	if (edge_serial->num_ports_open == 0) {
 		/* we are the first port to open, post the interrupt urb */
 		urb = edge_serial->serial->port[0]->interrupt_in_urb;
-		if (!urb) {
-			dev_err(&port->dev,
-				"%s - no interrupt urb present, exiting\n",
-				__func__);
-			status = -EINVAL;
-			goto release_es_lock;
-		}
 		urb->context = edge_serial;
 		status = usb_submit_urb(urb, GFP_KERNEL);
 		if (status) {
@@ -1959,12 +1952,6 @@ static int edge_open(struct tty_struct *tty, struct usb_serial_port *port)
 
 	/* start up our bulk read urb */
 	urb = port->read_urb;
-	if (!urb) {
-		dev_err(&port->dev, "%s - no read urb present, exiting\n",
-								__func__);
-		status = -EINVAL;
-		goto unlink_int_urb;
-	}
 	edge_port->ep_read_urb_state = EDGE_READ_URB_RUNNING;
 	urb->context = edge_port;
 	status = usb_submit_urb(urb, GFP_KERNEL);
@@ -2385,14 +2372,6 @@ static void edge_set_termios(struct tty_struct *tty,
 		struct usb_serial_port *port, struct ktermios *old_termios)
 {
 	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
-	unsigned int cflag;
-
-	cflag = tty->termios.c_cflag;
-
-	dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
-		tty->termios.c_cflag, tty->termios.c_iflag);
-	dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
-		old_termios->c_cflag, old_termios->c_iflag);
 
 	if (edge_port == NULL)
 		return;
@@ -2544,19 +2523,31 @@ static void edge_heartbeat_work(struct work_struct *work)
 	edge_heartbeat_schedule(serial);
 }
 
-static int edge_startup(struct usb_serial *serial)
+static int edge_calc_num_ports(struct usb_serial *serial,
+				struct usb_serial_endpoints *epds)
 {
-	struct edgeport_serial *edge_serial;
-	int status;
-	u16 product_id;
+	struct device *dev = &serial->interface->dev;
+	unsigned char num_ports = serial->type->num_ports;
 
 	/* Make sure we have the required endpoints when in download mode. */
 	if (serial->interface->cur_altsetting->desc.bNumEndpoints > 1) {
-		if (serial->num_bulk_in < serial->num_ports ||
-				serial->num_bulk_out < serial->num_ports)
+		if (epds->num_bulk_in < num_ports ||
+				epds->num_bulk_out < num_ports ||
+				epds->num_interrupt_in < 1) {
+			dev_err(dev, "required endpoints missing\n");
 			return -ENODEV;
+		}
 	}
 
+	return num_ports;
+}
+
+static int edge_startup(struct usb_serial *serial)
+{
+	struct edgeport_serial *edge_serial;
+	int status;
+	u16 product_id;
+
 	/* create our private serial structure */
 	edge_serial = kzalloc(sizeof(struct edgeport_serial), GFP_KERNEL);
 	if (!edge_serial)
@@ -2736,11 +2727,13 @@ static struct usb_serial_driver edgeport_1port_device = {
 	.description		= "Edgeport TI 1 port adapter",
 	.id_table		= edgeport_1port_id_table,
 	.num_ports		= 1,
+	.num_bulk_out		= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
+	.calc_num_ports		= edge_calc_num_ports,
 	.disconnect		= edge_disconnect,
 	.release		= edge_release,
 	.port_probe		= edge_port_probe,
@@ -2773,11 +2766,13 @@ static struct usb_serial_driver edgeport_2port_device = {
 	.description		= "Edgeport TI 2 port adapter",
 	.id_table		= edgeport_2port_id_table,
 	.num_ports		= 2,
+	.num_bulk_out		= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
+	.calc_num_ports		= edge_calc_num_ports,
 	.disconnect		= edge_disconnect,
 	.release		= edge_release,
 	.port_probe		= edge_port_probe,
diff --git a/drivers/usb/serial/ipaq.c b/drivers/usb/serial/ipaq.c
index ec1b8f2..cde0dcd 100644
--- a/drivers/usb/serial/ipaq.c
+++ b/drivers/usb/serial/ipaq.c
@@ -33,7 +33,8 @@ static int initial_wait;
 /* Function prototypes for an ipaq */
 static int  ipaq_open(struct tty_struct *tty,
 			struct usb_serial_port *port);
-static int  ipaq_calc_num_ports(struct usb_serial *serial);
+static int ipaq_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds);
 static int  ipaq_startup(struct usb_serial *serial);
 
 static const struct usb_device_id ipaq_id_table[] = {
@@ -550,42 +551,38 @@ static int ipaq_open(struct tty_struct *tty,
 	return usb_serial_generic_open(tty, port);
 }
 
-static int ipaq_calc_num_ports(struct usb_serial *serial)
+static int ipaq_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
 	/*
-	 * some devices have 3 endpoints, the 3rd of which
-	 * must be ignored as it would make the core
-	 * create a second port which oopses when used
+	 * Some of the devices in ipaq_id_table[] are composite, and we
+	 * shouldn't bind to all the interfaces. This test will rule out
+	 * some obviously invalid possibilities.
 	 */
-	int ipaq_num_ports = 1;
-
-	dev_dbg(&serial->dev->dev, "%s - numberofendpoints: %d\n", __func__,
-		(int)serial->interface->cur_altsetting->desc.bNumEndpoints);
+	if (epds->num_bulk_in == 0 || epds->num_bulk_out == 0)
+		return -ENODEV;
 
 	/*
-	 * a few devices have 4 endpoints, seemingly Yakuma devices,
-	 * and we need the second pair, so let them have 2 ports
-	 *
-	 * TODO: can we drop port 1 ?
+	 * A few devices have four endpoints, seemingly Yakuma devices, and
+	 * we need the second pair.
 	 */
-	if (serial->interface->cur_altsetting->desc.bNumEndpoints > 3) {
-		ipaq_num_ports = 2;
+	if (epds->num_bulk_in > 1 && epds->num_bulk_out > 1) {
+		epds->bulk_in[0] = epds->bulk_in[1];
+		epds->bulk_out[0] = epds->bulk_out[1];
 	}
 
-	return ipaq_num_ports;
-}
+	/*
+	 * Other devices have 3 endpoints, but we only use the first bulk in
+	 * and out endpoints.
+	 */
+	epds->num_bulk_in = 1;
+	epds->num_bulk_out = 1;
 
+	return 1;
+}
 
 static int ipaq_startup(struct usb_serial *serial)
 {
-	/* Some of the devices in ipaq_id_table[] are composite, and we
-	 * shouldn't bind to all the interfaces.  This test will rule out
-	 * some obviously invalid possibilities.
-	 */
-	if (serial->num_bulk_in < serial->num_ports ||
-			serial->num_bulk_out < serial->num_ports)
-		return -ENODEV;
-
 	if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
 		/*
 		 * FIXME: HP iPaq rx3715, possibly others, have 1 config that
@@ -597,10 +594,6 @@ static int ipaq_startup(struct usb_serial *serial)
 		return -ENODEV;
 	}
 
-	dev_dbg(&serial->dev->dev,
-		"%s - iPAQ module configured for %d ports\n", __func__,
-		serial->num_ports);
-
 	return usb_reset_configuration(serial->dev);
 }
 
diff --git a/drivers/usb/serial/iuu_phoenix.c b/drivers/usb/serial/iuu_phoenix.c
index 030390f..18fc992 100644
--- a/drivers/usb/serial/iuu_phoenix.c
+++ b/drivers/usb/serial/iuu_phoenix.c
@@ -68,16 +68,6 @@ struct iuu_private {
 	u32 clk;
 };
 
-static int iuu_attach(struct usb_serial *serial)
-{
-	unsigned char num_ports = serial->num_ports;
-
-	if (serial->num_bulk_in < num_ports || serial->num_bulk_out < num_ports)
-		return -ENODEV;
-
-	return 0;
-}
-
 static int iuu_port_probe(struct usb_serial_port *port)
 {
 	struct iuu_private *priv;
@@ -598,9 +588,8 @@ static void read_buf_callback(struct urb *urb)
 	}
 
 	dev_dbg(&port->dev, "%s - %i chars to write\n", __func__, urb->actual_length);
-	if (data == NULL)
-		dev_dbg(&port->dev, "%s - data is NULL !!!\n", __func__);
-	if (urb->actual_length && data) {
+
+	if (urb->actual_length) {
 		tty_insert_flip_string(&port->port, data, urb->actual_length);
 		tty_flip_buffer_push(&port->port);
 	}
@@ -665,10 +654,8 @@ static void iuu_uart_read_callback(struct urb *urb)
 		/* error stop all */
 		return;
 	}
-	if (data == NULL)
-		dev_dbg(&port->dev, "%s - data is NULL !!!\n", __func__);
 
-	if (urb->actual_length == 1  && data != NULL)
+	if (urb->actual_length == 1)
 		len = (int) data[0];
 
 	if (urb->actual_length > 1) {
@@ -1183,6 +1170,8 @@ static struct usb_serial_driver iuu_device = {
 		   },
 	.id_table = id_table,
 	.num_ports = 1,
+	.num_bulk_in = 1,
+	.num_bulk_out = 1,
 	.bulk_in_size = 512,
 	.bulk_out_size = 512,
 	.open = iuu_open,
@@ -1193,7 +1182,6 @@ static struct usb_serial_driver iuu_device = {
 	.tiocmset = iuu_tiocmset,
 	.set_termios = iuu_set_termios,
 	.init_termios = iuu_init_termios,
-	.attach = iuu_attach,
 	.port_probe = iuu_port_probe,
 	.port_remove = iuu_port_remove,
 };
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index d2dab2a..196908d 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -708,19 +708,6 @@ MODULE_FIRMWARE("keyspan_pda/keyspan_pda.fw");
 MODULE_FIRMWARE("keyspan_pda/xircom_pgs.fw");
 #endif
 
-static int keyspan_pda_attach(struct usb_serial *serial)
-{
-	unsigned char num_ports = serial->num_ports;
-
-	if (serial->num_bulk_out < num_ports ||
-			serial->num_interrupt_in < num_ports) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int keyspan_pda_port_probe(struct usb_serial_port *port)
 {
 
@@ -784,6 +771,8 @@ static struct usb_serial_driver keyspan_pda_device = {
 	.description =		"Keyspan PDA",
 	.id_table =		id_table_std,
 	.num_ports =		1,
+	.num_bulk_out =		1,
+	.num_interrupt_in =	1,
 	.dtr_rts =		keyspan_pda_dtr_rts,
 	.open =			keyspan_pda_open,
 	.close =		keyspan_pda_close,
@@ -798,7 +787,6 @@ static struct usb_serial_driver keyspan_pda_device = {
 	.break_ctl =		keyspan_pda_break_ctl,
 	.tiocmget =		keyspan_pda_tiocmget,
 	.tiocmset =		keyspan_pda_tiocmset,
-	.attach =		keyspan_pda_attach,
 	.port_probe =		keyspan_pda_port_probe,
 	.port_remove =		keyspan_pda_port_remove,
 };
diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index 813035f..3024b9b 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -51,7 +51,6 @@
 
 
 /* Function prototypes */
-static int kobil_attach(struct usb_serial *serial);
 static int kobil_port_probe(struct usb_serial_port *probe);
 static int kobil_port_remove(struct usb_serial_port *probe);
 static int  kobil_open(struct tty_struct *tty, struct usb_serial_port *port);
@@ -87,7 +86,7 @@ static struct usb_serial_driver kobil_device = {
 	.description =		"KOBIL USB smart card terminal",
 	.id_table =		id_table,
 	.num_ports =		1,
-	.attach =		kobil_attach,
+	.num_interrupt_out =	1,
 	.port_probe =		kobil_port_probe,
 	.port_remove =		kobil_port_remove,
 	.ioctl =		kobil_ioctl,
@@ -115,16 +114,6 @@ struct kobil_private {
 };
 
 
-static int kobil_attach(struct usb_serial *serial)
-{
-	if (serial->num_interrupt_out < serial->num_ports) {
-		dev_err(&serial->interface->dev, "missing interrupt-out endpoint\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int kobil_port_probe(struct usb_serial_port *port)
 {
 	struct usb_serial *serial = port->serial;
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index f075121c..a453965 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -973,11 +973,24 @@ static void mos7720_bulk_out_data_callback(struct urb *urb)
 		tty_port_tty_wakeup(&mos7720_port->port->port);
 }
 
-static int mos77xx_calc_num_ports(struct usb_serial *serial)
+static int mos77xx_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
 	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
-	if (product == MOSCHIP_DEVICE_ID_7715)
+
+	if (product == MOSCHIP_DEVICE_ID_7715) {
+		/*
+		 * The 7715 uses the first bulk in/out endpoint pair for the
+		 * parallel port, and the second for the serial port. We swap
+		 * the endpoint descriptors here so that the the first and
+		 * only registered port structure uses the serial-port
+		 * endpoints.
+		 */
+		swap(epds->bulk_in[0], epds->bulk_in[1]);
+		swap(epds->bulk_out[0], epds->bulk_out[1]);
+
 		return 1;
+	}
 
 	return 2;
 }
@@ -1395,7 +1408,7 @@ struct divisor_table_entry {
 /* Define table of divisors for moschip 7720 hardware	   *
  * These assume a 3.6864MHz crystal, the standard /16, and *
  * MCR.7 = 0.						   */
-static struct divisor_table_entry divisor_table[] = {
+static const struct divisor_table_entry divisor_table[] = {
 	{   50,		2304},
 	{   110,	1047},	/* 2094.545455 => 230450   => .0217 % over */
 	{   134,	857},	/* 1713.011152 => 230398.5 => .00065% under */
@@ -1675,7 +1688,6 @@ static void mos7720_set_termios(struct tty_struct *tty,
 		struct usb_serial_port *port, struct ktermios *old_termios)
 {
 	int status;
-	unsigned int cflag;
 	struct usb_serial *serial;
 	struct moschip_port *mos7720_port;
 
@@ -1691,16 +1703,6 @@ static void mos7720_set_termios(struct tty_struct *tty,
 		return;
 	}
 
-	dev_dbg(&port->dev, "setting termios - ASPIRE\n");
-
-	cflag = tty->termios.c_cflag;
-
-	dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
-		tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
-
-	dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
-		old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
-
 	/* change the port settings to the new ones specified */
 	change_port_settings(tty, mos7720_port, old_termios);
 
@@ -1900,54 +1902,24 @@ static int mos7720_startup(struct usb_serial *serial)
 	u16 product;
 	int ret_val;
 
-	if (serial->num_bulk_in < 2 || serial->num_bulk_out < 2) {
-		dev_err(&serial->interface->dev, "missing bulk endpoints\n");
-		return -ENODEV;
-	}
-
 	product = le16_to_cpu(serial->dev->descriptor.idProduct);
 	dev = serial->dev;
 
-	/*
-	 * The 7715 uses the first bulk in/out endpoint pair for the parallel
-	 * port, and the second for the serial port.  Because the usbserial core
-	 * assumes both pairs are serial ports, we must engage in a bit of
-	 * subterfuge and swap the pointers for ports 0 and 1 in order to make
-	 * port 0 point to the serial port.  However, both moschip devices use a
-	 * single interrupt-in endpoint for both ports (as mentioned a little
-	 * further down), and this endpoint was assigned to port 0.  So after
-	 * the swap, we must copy the interrupt endpoint elements from port 1
-	 * (as newly assigned) to port 0, and null out port 1 pointers.
-	 */
-	if (product == MOSCHIP_DEVICE_ID_7715) {
-		struct usb_serial_port *tmp = serial->port[0];
-		serial->port[0] = serial->port[1];
-		serial->port[1] = tmp;
-		serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
-		serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
-		serial->port[0]->interrupt_in_endpointAddress =
-			tmp->interrupt_in_endpointAddress;
-		serial->port[1]->interrupt_in_urb = NULL;
-		serial->port[1]->interrupt_in_buffer = NULL;
-
-		if (serial->port[0]->interrupt_in_urb) {
-			struct urb *urb = serial->port[0]->interrupt_in_urb;
-
-			urb->complete = mos7715_interrupt_callback;
-		}
-	}
-
 	/* setting configuration feature to one */
 	usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 			(__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
 
-#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
 	if (product == MOSCHIP_DEVICE_ID_7715) {
+		struct urb *urb = serial->port[0]->interrupt_in_urb;
+
+		urb->complete = mos7715_interrupt_callback;
+
+#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
 		ret_val = mos7715_parport_init(serial);
 		if (ret_val < 0)
 			return ret_val;
-	}
 #endif
+	}
 	/* start the interrupt urb */
 	ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
 	if (ret_val) {
@@ -2039,6 +2011,9 @@ static struct usb_serial_driver moschip7720_2port_driver = {
 	},
 	.description		= "Moschip 2 port adapter",
 	.id_table		= id_table,
+	.num_bulk_in		= 2,
+	.num_bulk_out		= 2,
+	.num_interrupt_in	= 1,
 	.calc_num_ports		= mos77xx_calc_num_ports,
 	.open			= mos7720_open,
 	.close			= mos7720_close,
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 3821c53..e8669aae 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1868,7 +1868,6 @@ static void mos7840_set_termios(struct tty_struct *tty,
 				struct ktermios *old_termios)
 {
 	int status;
-	unsigned int cflag;
 	struct usb_serial *serial;
 	struct moschip_port *mos7840_port;
 
@@ -1890,15 +1889,6 @@ static void mos7840_set_termios(struct tty_struct *tty,
 		return;
 	}
 
-	dev_dbg(&port->dev, "%s", "setting termios - \n");
-
-	cflag = tty->termios.c_cflag;
-
-	dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
-		tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
-	dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
-		old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
-
 	/* change the port settings to the new ones specified */
 
 	mos7840_change_port_settings(tty, mos7840_port, old_termios);
@@ -2104,26 +2094,27 @@ out:
 	return 0;
 }
 
-static int mos7840_calc_num_ports(struct usb_serial *serial)
+static int mos7840_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
 	int device_type = (unsigned long)usb_get_serial_data(serial);
-	int mos7840_num_ports;
+	int num_ports;
 
-	mos7840_num_ports = (device_type >> 4) & 0x000F;
+	num_ports = (device_type >> 4) & 0x000F;
 
-	return mos7840_num_ports;
-}
+	/*
+	 * num_ports is currently never zero as device_type is one of
+	 * MOSCHIP_DEVICE_ID_78{1,2,4}0.
+	 */
+	if (num_ports == 0)
+		return -ENODEV;
 
-static int mos7840_attach(struct usb_serial *serial)
-{
-	if (serial->num_bulk_in < serial->num_ports ||
-			serial->num_bulk_out < serial->num_ports ||
-			serial->num_interrupt_in < 1) {
+	if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
 		dev_err(&serial->interface->dev, "missing endpoints\n");
 		return -ENODEV;
 	}
 
-	return 0;
+	return num_ports;
 }
 
 static int mos7840_port_probe(struct usb_serial_port *port)
@@ -2384,7 +2375,7 @@ static struct usb_serial_driver moschip7840_4port_device = {
 		   },
 	.description = DRIVER_DESC,
 	.id_table = id_table,
-	.num_ports = 4,
+	.num_interrupt_in = 1,
 	.open = mos7840_open,
 	.close = mos7840_close,
 	.write = mos7840_write,
@@ -2401,7 +2392,6 @@ static struct usb_serial_driver moschip7840_4port_device = {
 	.tiocmset = mos7840_tiocmset,
 	.tiocmiwait = usb_serial_generic_tiocmiwait,
 	.get_icount = usb_serial_generic_get_icount,
-	.attach = mos7840_attach,
 	.port_probe = mos7840_port_probe,
 	.port_remove = mos7840_port_remove,
 	.read_bulk_callback = mos7840_bulk_in_callback,
diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c
index c88215a..3aef091 100644
--- a/drivers/usb/serial/mxuport.c
+++ b/drivers/usb/serial/mxuport.c
@@ -946,20 +946,39 @@ out:
  * Determine how many ports this device has dynamically.  It will be
  * called after the probe() callback is called, but before attach().
  */
-static int mxuport_calc_num_ports(struct usb_serial *serial)
+static int mxuport_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
 	unsigned long features = (unsigned long)usb_get_serial_data(serial);
+	int num_ports;
+	int i;
 
-	if (features & MX_UPORT_2_PORT)
-		return 2;
-	if (features & MX_UPORT_4_PORT)
-		return 4;
-	if (features & MX_UPORT_8_PORT)
-		return 8;
-	if (features & MX_UPORT_16_PORT)
-		return 16;
+	if (features & MX_UPORT_2_PORT) {
+		num_ports = 2;
+	} else if (features & MX_UPORT_4_PORT) {
+		num_ports = 4;
+	} else if (features & MX_UPORT_8_PORT) {
+		num_ports = 8;
+	} else if (features & MX_UPORT_16_PORT) {
+		num_ports = 16;
+	} else {
+		dev_warn(&serial->interface->dev,
+				"unknown device, assuming two ports\n");
+		num_ports = 2;
+	}
 
-	return 0;
+	/*
+	 * Setup bulk-out endpoint multiplexing. All ports share the same
+	 * bulk-out endpoint.
+	 */
+	BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < 16);
+
+	for (i = 1; i < num_ports; ++i)
+		epds->bulk_out[i] = epds->bulk_out[0];
+
+	epds->num_bulk_out = num_ports;
+
+	return num_ports;
 }
 
 /* Get the version of the firmware currently running. */
@@ -1142,102 +1161,11 @@ static int mxuport_port_probe(struct usb_serial_port *port)
 				     port->port_number);
 }
 
-static int mxuport_alloc_write_urb(struct usb_serial *serial,
-				   struct usb_serial_port *port,
-				   struct usb_serial_port *port0,
-				   int j)
-{
-	struct usb_device *dev = interface_to_usbdev(serial->interface);
-
-	set_bit(j, &port->write_urbs_free);
-	port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
-	if (!port->write_urbs[j])
-		return -ENOMEM;
-
-	port->bulk_out_buffers[j] = kmalloc(port0->bulk_out_size, GFP_KERNEL);
-	if (!port->bulk_out_buffers[j])
-		return -ENOMEM;
-
-	usb_fill_bulk_urb(port->write_urbs[j], dev,
-			  usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
-			  port->bulk_out_buffers[j],
-			  port->bulk_out_size,
-			  serial->type->write_bulk_callback,
-			  port);
-	return 0;
-}
-
-
-static int mxuport_alloc_write_urbs(struct usb_serial *serial,
-				    struct usb_serial_port *port,
-				    struct usb_serial_port *port0)
-{
-	int j;
-	int ret;
-
-	for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
-		ret = mxuport_alloc_write_urb(serial, port, port0, j);
-		if (ret)
-			return ret;
-	}
-	return 0;
-}
-
-
 static int mxuport_attach(struct usb_serial *serial)
 {
 	struct usb_serial_port *port0 = serial->port[0];
 	struct usb_serial_port *port1 = serial->port[1];
-	struct usb_serial_port *port;
 	int err;
-	int i;
-	int j;
-
-	/*
-	 * Throw away all but the first allocated write URBs so we can
-	 * set them up again to fit the multiplexing scheme.
-	 */
-	for (i = 1; i < serial->num_bulk_out; ++i) {
-		port = serial->port[i];
-		for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
-			usb_free_urb(port->write_urbs[j]);
-			kfree(port->bulk_out_buffers[j]);
-			port->write_urbs[j] = NULL;
-			port->bulk_out_buffers[j] = NULL;
-		}
-		port->write_urbs_free = 0;
-	}
-
-	/*
-	 * All write data is sent over the first bulk out endpoint,
-	 * with an added header to indicate the port. Allocate URBs
-	 * for each port to the first bulk out endpoint.
-	 */
-	for (i = 1; i < serial->num_ports; ++i) {
-		port = serial->port[i];
-		port->bulk_out_size = port0->bulk_out_size;
-		port->bulk_out_endpointAddress =
-			port0->bulk_out_endpointAddress;
-
-		err = mxuport_alloc_write_urbs(serial, port, port0);
-		if (err)
-			return err;
-
-		port->write_urb = port->write_urbs[0];
-		port->bulk_out_buffer = port->bulk_out_buffers[0];
-
-		/*
-		 * Ensure each port has a fifo. The framework only
-		 * allocates a fifo to ports with a bulk out endpoint,
-		 * where as we need one for every port.
-		 */
-		if (!kfifo_initialized(&port->write_fifo)) {
-			err = kfifo_alloc(&port->write_fifo, PAGE_SIZE,
-					  GFP_KERNEL);
-			if (err)
-				return err;
-		}
-	}
 
 	/*
 	 * All data from the ports is received on the first bulk in
@@ -1366,7 +1294,8 @@ static struct usb_serial_driver mxuport_device = {
 	},
 	.description		= "MOXA UPort",
 	.id_table		= mxuport_idtable,
-	.num_ports		= 0,
+	.num_bulk_in		= 2,
+	.num_bulk_out		= 1,
 	.probe			= mxuport_probe,
 	.port_probe		= mxuport_port_probe,
 	.attach			= mxuport_attach,
diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c
index dd70695..efcd7fe 100644
--- a/drivers/usb/serial/omninet.c
+++ b/drivers/usb/serial/omninet.c
@@ -1,6 +1,8 @@
 /*
  * USB ZyXEL omni.net LCD PLUS driver
  *
+ * Copyright (C) 2013,2017 Johan Hovold <johan@kernel.org>
+ *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License version
  *	2 as published by the Free Software Foundation.
@@ -32,12 +34,10 @@
 
 /* function prototypes */
 static void omninet_process_read_urb(struct urb *urb);
-static void omninet_write_bulk_callback(struct urb *urb);
-static int  omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
-				const unsigned char *buf, int count);
-static int  omninet_write_room(struct tty_struct *tty);
-static void omninet_disconnect(struct usb_serial *serial);
-static int omninet_attach(struct usb_serial *serial);
+static int omninet_prepare_write_buffer(struct usb_serial_port *port,
+				void *buf, size_t count);
+static int omninet_calc_num_ports(struct usb_serial *serial,
+				struct usb_serial_endpoints *epds);
 static int omninet_port_probe(struct usb_serial_port *port);
 static int omninet_port_remove(struct usb_serial_port *port);
 
@@ -55,15 +55,12 @@ static struct usb_serial_driver zyxel_omninet_device = {
 	},
 	.description =		"ZyXEL - omni.net lcd plus usb",
 	.id_table =		id_table,
-	.num_ports =		1,
-	.attach =		omninet_attach,
+	.num_bulk_out =		2,
+	.calc_num_ports =	omninet_calc_num_ports,
 	.port_probe =		omninet_port_probe,
 	.port_remove =		omninet_port_remove,
-	.write =		omninet_write,
-	.write_room =		omninet_write_room,
-	.write_bulk_callback =	omninet_write_bulk_callback,
 	.process_read_urb =	omninet_process_read_urb,
-	.disconnect =		omninet_disconnect,
+	.prepare_write_buffer =	omninet_prepare_write_buffer,
 };
 
 static struct usb_serial_driver * const serial_drivers[] = {
@@ -104,15 +101,14 @@ struct omninet_data {
 	__u8	od_outseq;	/* Sequence number for bulk_out URBs */
 };
 
-static int omninet_attach(struct usb_serial *serial)
+static int omninet_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
-	/* The second bulk-out endpoint is used for writing. */
-	if (serial->num_bulk_out < 2) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
+	/* We need only the second bulk-out for our single-port device. */
+	epds->bulk_out[0] = epds->bulk_out[1];
+	epds->num_bulk_out = 1;
 
-	return 0;
+	return 1;
 }
 
 static int omninet_port_probe(struct usb_serial_port *port)
@@ -159,96 +155,24 @@ static void omninet_process_read_urb(struct urb *urb)
 	tty_flip_buffer_push(&port->port);
 }
 
-static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
-					const unsigned char *buf, int count)
+static int omninet_prepare_write_buffer(struct usb_serial_port *port,
+					void *buf, size_t count)
 {
-	struct usb_serial *serial = port->serial;
-	struct usb_serial_port *wport = serial->port[1];
-
 	struct omninet_data *od = usb_get_serial_port_data(port);
-	struct omninet_header *header = (struct omninet_header *)
-					wport->write_urb->transfer_buffer;
-
-	int			result;
-
-	if (count == 0) {
-		dev_dbg(&port->dev, "%s - write request of 0 bytes\n", __func__);
-		return 0;
-	}
-
-	if (!test_and_clear_bit(0, &port->write_urbs_free)) {
-		dev_dbg(&port->dev, "%s - already writing\n", __func__);
-		return 0;
-	}
-
-	count = (count > OMNINET_PAYLOADSIZE) ? OMNINET_PAYLOADSIZE : count;
-
-	memcpy(wport->write_urb->transfer_buffer + OMNINET_HEADERLEN,
-								buf, count);
-
-	usb_serial_debug_data(&port->dev, __func__, count,
-			      wport->write_urb->transfer_buffer);
-
-	header->oh_seq 	= od->od_outseq++;
-	header->oh_len 	= count;
-	header->oh_xxx  = 0x03;
-	header->oh_pad 	= 0x00;
-
-	/* send the data out the bulk port, always 64 bytes */
-	wport->write_urb->transfer_buffer_length = OMNINET_BULKOUTSIZE;
-
-	result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
-	if (result) {
-		set_bit(0, &wport->write_urbs_free);
-		dev_err_console(port,
-			"%s - failed submitting write urb, error %d\n",
-			__func__, result);
-	} else
-		result = count;
-
-	return result;
-}
+	struct omninet_header *header = buf;
 
+	count = min_t(size_t, count, OMNINET_PAYLOADSIZE);
 
-static int omninet_write_room(struct tty_struct *tty)
-{
-	struct usb_serial_port *port = tty->driver_data;
-	struct usb_serial 	*serial = port->serial;
-	struct usb_serial_port 	*wport 	= serial->port[1];
-
-	int room = 0; /* Default: no room */
-
-	if (test_bit(0, &wport->write_urbs_free))
-		room = wport->bulk_out_size - OMNINET_HEADERLEN;
-
-	dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
-
-	return room;
-}
-
-static void omninet_write_bulk_callback(struct urb *urb)
-{
-/*	struct omninet_header	*header = (struct omninet_header  *)
-						urb->transfer_buffer; */
-	struct usb_serial_port 	*port   =  urb->context;
-	int status = urb->status;
-
-	set_bit(0, &port->write_urbs_free);
-	if (status) {
-		dev_dbg(&port->dev, "%s - nonzero write bulk status received: %d\n",
-			__func__, status);
-		return;
-	}
+	count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN,
+			count, &port->lock);
 
-	usb_serial_port_softint(port);
-}
-
-
-static void omninet_disconnect(struct usb_serial *serial)
-{
-	struct usb_serial_port *wport = serial->port[1];
+	header->oh_seq = od->od_outseq++;
+	header->oh_len = count;
+	header->oh_xxx = 0x03;
+	header->oh_pad = 0x00;
 
-	usb_kill_urb(wport->write_urb);
+	/* always 64 bytes */
+	return OMNINET_BULKOUTSIZE;
 }
 
 module_usb_serial_driver(serial_drivers, id_table);
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 3937b9c..58657d6 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -367,16 +367,6 @@ static int opticon_ioctl(struct tty_struct *tty,
 	return -ENOIOCTLCMD;
 }
 
-static int opticon_startup(struct usb_serial *serial)
-{
-	if (!serial->num_bulk_in) {
-		dev_err(&serial->dev->dev, "no bulk in endpoint\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int opticon_port_probe(struct usb_serial_port *port)
 {
 	struct opticon_private *priv;
@@ -408,8 +398,8 @@ static struct usb_serial_driver opticon_device = {
 	},
 	.id_table =		id_table,
 	.num_ports =		1,
+	.num_bulk_in =		1,
 	.bulk_in_size =		256,
-	.attach =		opticon_startup,
 	.port_probe =		opticon_port_probe,
 	.port_remove =		opticon_port_remove,
 	.open =			opticon_open,
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index b8bf52b..b11eead 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -134,7 +134,6 @@ static int oti6858_chars_in_buffer(struct tty_struct *tty);
 static int oti6858_tiocmget(struct tty_struct *tty);
 static int oti6858_tiocmset(struct tty_struct *tty,
 				unsigned int set, unsigned int clear);
-static int oti6858_attach(struct usb_serial *serial);
 static int oti6858_port_probe(struct usb_serial_port *port);
 static int oti6858_port_remove(struct usb_serial_port *port);
 
@@ -146,6 +145,9 @@ static struct usb_serial_driver oti6858_device = {
 	},
 	.id_table =		id_table,
 	.num_ports =		1,
+	.num_bulk_in =		1,
+	.num_bulk_out =		1,
+	.num_interrupt_in =	1,
 	.open =			oti6858_open,
 	.close =		oti6858_close,
 	.write =		oti6858_write,
@@ -159,7 +161,6 @@ static struct usb_serial_driver oti6858_device = {
 	.write_bulk_callback =	oti6858_write_bulk_callback,
 	.write_room =		oti6858_write_room,
 	.chars_in_buffer =	oti6858_chars_in_buffer,
-	.attach =		oti6858_attach,
 	.port_probe =		oti6858_port_probe,
 	.port_remove =		oti6858_port_remove,
 };
@@ -326,20 +327,6 @@ static void send_data(struct work_struct *work)
 	usb_serial_port_softint(port);
 }
 
-static int oti6858_attach(struct usb_serial *serial)
-{
-	unsigned char num_ports = serial->num_ports;
-
-	if (serial->num_bulk_in < num_ports ||
-			serial->num_bulk_out < num_ports ||
-			serial->num_interrupt_in < num_ports) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int oti6858_port_probe(struct usb_serial_port *port)
 {
 	struct oti6858_private *priv;
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index ca69eb4..c9ebefd 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -33,9 +33,11 @@
 
 #define PL2303_QUIRK_UART_STATE_IDX0		BIT(0)
 #define PL2303_QUIRK_LEGACY			BIT(1)
+#define PL2303_QUIRK_ENDPOINT_HACK		BIT(2)
 
 static const struct usb_device_id id_table[] = {
-	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
+	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
+		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
@@ -48,7 +50,8 @@ static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
 	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
 	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
-	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
+	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
+		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
 	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
 	{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
 	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
@@ -68,7 +71,8 @@ static const struct usb_device_id id_table[] = {
 		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
 		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
-	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
+	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
+		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
 	{ USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
 	{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
 	{ USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
@@ -78,7 +82,8 @@ static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
 	{ USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
 	{ USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
-	{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
+	{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
+		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
 	{ USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
 	{ USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
 	{ USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
@@ -218,20 +223,68 @@ static int pl2303_probe(struct usb_serial *serial,
 	return 0;
 }
 
+/*
+ * Use interrupt endpoint from first interface if available.
+ *
+ * This is needed due to the looney way its endpoints are set up.
+ */
+static int pl2303_endpoint_hack(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
+{
+	struct usb_interface *interface = serial->interface;
+	struct usb_device *dev = serial->dev;
+	struct device *ddev = &interface->dev;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	unsigned int i;
+
+	if (interface == dev->actconfig->interface[0])
+		return 0;
+
+	/* check out the endpoints of the other interface */
+	iface_desc = dev->actconfig->interface[0]->cur_altsetting;
+
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+
+		if (!usb_endpoint_is_int_in(endpoint))
+			continue;
+
+		dev_dbg(ddev, "found interrupt in on separate interface\n");
+		if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
+			epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
+	}
+
+	return 0;
+}
+
+static int pl2303_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
+{
+	unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
+	struct device *dev = &serial->interface->dev;
+	int ret;
+
+	if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
+		ret = pl2303_endpoint_hack(serial, epds);
+		if (ret)
+			return ret;
+	}
+
+	if (epds->num_interrupt_in < 1) {
+		dev_err(dev, "required interrupt-in endpoint missing\n");
+		return -ENODEV;
+	}
+
+	return 1;
+}
+
 static int pl2303_startup(struct usb_serial *serial)
 {
 	struct pl2303_serial_private *spriv;
-	unsigned char num_ports = serial->num_ports;
 	enum pl2303_type type = TYPE_01;
 	unsigned char *buf;
 
-	if (serial->num_bulk_in < num_ports ||
-			serial->num_bulk_out < num_ports ||
-			serial->num_interrupt_in < num_ports) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
-
 	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 	if (!spriv)
 		return -ENOMEM;
@@ -938,7 +991,9 @@ static struct usb_serial_driver pl2303_device = {
 		.name =		"pl2303",
 	},
 	.id_table =		id_table,
-	.num_ports =		1,
+	.num_bulk_in =		1,
+	.num_bulk_out =		1,
+	.num_interrupt_in =	0,	/* see pl2303_calc_num_ports */
 	.bulk_in_size =		256,
 	.bulk_out_size =	256,
 	.open =			pl2303_open,
@@ -954,6 +1009,7 @@ static struct usb_serial_driver pl2303_device = {
 	.process_read_urb =	pl2303_process_read_urb,
 	.read_int_callback =	pl2303_read_int_callback,
 	.probe =		pl2303_probe,
+	.calc_num_ports =	pl2303_calc_num_ports,
 	.attach =		pl2303_startup,
 	.release =		pl2303_release,
 	.port_probe =		pl2303_port_probe,
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index fdbb904..60e17d1 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -246,7 +246,8 @@ static inline int update_mctrl(struct qt2_port_private *port_priv,
 	return status;
 }
 
-static int qt2_calc_num_ports(struct usb_serial *serial)
+static int qt2_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
 	struct qt2_device_detail d;
 	int i;
@@ -600,7 +601,6 @@ static void qt2_process_read_urb(struct urb *urb)
 				escapeflag = true;
 				break;
 			case QT2_CONTROL_ESCAPE:
-				tty_buffer_request_room(&port->port, 2);
 				tty_insert_flip_string(&port->port, ch, 2);
 				i += 2;
 				escapeflag = true;
@@ -615,8 +615,7 @@ static void qt2_process_read_urb(struct urb *urb)
 				continue;
 		}
 
-		tty_buffer_request_room(&port->port, 1);
-		tty_insert_flip_string(&port->port, ch, 1);
+		tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
 	}
 
 	tty_flip_buffer_push(&port->port);
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 465e851..4c4ac47 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -85,7 +85,8 @@ static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
 			USB_CTRL_SET_TIMEOUT);		/* int timeout       */
 }
 
-static int sierra_calc_num_ports(struct usb_serial *serial)
+static int sierra_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
 	int num_ports = 0;
 	u8 ifnum, numendpoints;
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index ddfd787..5167b65 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -154,19 +154,6 @@ static int spcp8x5_probe(struct usb_serial *serial,
 	return 0;
 }
 
-static int spcp8x5_attach(struct usb_serial *serial)
-{
-	unsigned char num_ports = serial->num_ports;
-
-	if (serial->num_bulk_in < num_ports ||
-			serial->num_bulk_out < num_ports) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int spcp8x5_port_probe(struct usb_serial_port *port)
 {
 	const struct usb_device_id *id = usb_get_serial_data(port->serial);
@@ -488,6 +475,8 @@ static struct usb_serial_driver spcp8x5_device = {
 	},
 	.id_table		= id_table,
 	.num_ports		= 1,
+	.num_bulk_in		= 1,
+	.num_bulk_out		= 1,
 	.open			= spcp8x5_open,
 	.dtr_rts		= spcp8x5_dtr_rts,
 	.carrier_raised		= spcp8x5_carrier_raised,
@@ -496,7 +485,6 @@ static struct usb_serial_driver spcp8x5_device = {
 	.tiocmget		= spcp8x5_tiocmget,
 	.tiocmset		= spcp8x5_tiocmset,
 	.probe			= spcp8x5_probe,
-	.attach			= spcp8x5_attach,
 	.port_probe		= spcp8x5_port_probe,
 	.port_remove		= spcp8x5_port_remove,
 };
diff --git a/drivers/usb/serial/symbolserial.c b/drivers/usb/serial/symbolserial.c
index 37f3ad1..0d17272 100644
--- a/drivers/usb/serial/symbolserial.c
+++ b/drivers/usb/serial/symbolserial.c
@@ -147,16 +147,6 @@ static void symbol_unthrottle(struct tty_struct *tty)
 	}
 }
 
-static int symbol_startup(struct usb_serial *serial)
-{
-	if (!serial->num_interrupt_in) {
-		dev_err(&serial->dev->dev, "no interrupt-in endpoint\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int symbol_port_probe(struct usb_serial_port *port)
 {
 	struct symbol_private *priv;
@@ -188,7 +178,7 @@ static struct usb_serial_driver symbol_device = {
 	},
 	.id_table =		id_table,
 	.num_ports =		1,
-	.attach =		symbol_startup,
+	.num_interrupt_in =	1,
 	.port_probe =		symbol_port_probe,
 	.port_remove =		symbol_port_remove,
 	.open =			symbol_open,
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 3107bf5..8fc3854 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -427,6 +427,7 @@ static struct usb_serial_driver ti_1port_device = {
 	.description		= "TI USB 3410 1 port adapter",
 	.id_table		= ti_id_table_3410,
 	.num_ports		= 1,
+	.num_bulk_out		= 1,
 	.attach			= ti_startup,
 	.release		= ti_release,
 	.port_probe		= ti_port_probe,
@@ -459,6 +460,7 @@ static struct usb_serial_driver ti_2port_device = {
 	.description		= "TI USB 5052 2 port adapter",
 	.id_table		= ti_id_table_5052,
 	.num_ports		= 2,
+	.num_bulk_out		= 1,
 	.attach			= ti_startup,
 	.release		= ti_release,
 	.port_probe		= ti_port_probe,
@@ -927,7 +929,6 @@ static void ti_set_termios(struct tty_struct *tty,
 {
 	struct ti_port *tport = usb_get_serial_port_data(port);
 	struct ti_uart_config *config;
-	tcflag_t cflag, iflag;
 	int baud;
 	int status;
 	int port_number = port->port_number;
@@ -935,13 +936,6 @@ static void ti_set_termios(struct tty_struct *tty,
 	u16 wbaudrate;
 	u16 wflags = 0;
 
-	cflag = tty->termios.c_cflag;
-	iflag = tty->termios.c_iflag;
-
-	dev_dbg(&port->dev, "%s - cflag %08x, iflag %08x\n", __func__, cflag, iflag);
-	dev_dbg(&port->dev, "%s - old clfag %08x, old iflag %08x\n", __func__,
-		old_termios->c_cflag, old_termios->c_iflag);
-
 	config = kmalloc(sizeof(*config), GFP_KERNEL);
 	if (!config)
 		return;
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 4a037b4..c7ca95f 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -38,7 +38,6 @@
 #include <linux/usb/serial.h>
 #include <linux/kfifo.h>
 #include <linux/idr.h>
-#include "pl2303.h"
 
 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
 #define DRIVER_DESC "USB Serial Driver core"
@@ -710,6 +709,39 @@ static const struct tty_port_operations serial_port_ops = {
 	.shutdown		= serial_port_shutdown,
 };
 
+static void find_endpoints(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
+{
+	struct device *dev = &serial->interface->dev;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *epd;
+	unsigned int i;
+
+	BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_in) < USB_MAXENDPOINTS / 2);
+	BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < USB_MAXENDPOINTS / 2);
+	BUILD_BUG_ON(ARRAY_SIZE(epds->interrupt_in) < USB_MAXENDPOINTS / 2);
+	BUILD_BUG_ON(ARRAY_SIZE(epds->interrupt_out) < USB_MAXENDPOINTS / 2);
+
+	iface_desc = serial->interface->cur_altsetting;
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		epd = &iface_desc->endpoint[i].desc;
+
+		if (usb_endpoint_is_bulk_in(epd)) {
+			dev_dbg(dev, "found bulk in on endpoint %u\n", i);
+			epds->bulk_in[epds->num_bulk_in++] = epd;
+		} else if (usb_endpoint_is_bulk_out(epd)) {
+			dev_dbg(dev, "found bulk out on endpoint %u\n", i);
+			epds->bulk_out[epds->num_bulk_out++] = epd;
+		} else if (usb_endpoint_is_int_in(epd)) {
+			dev_dbg(dev, "found interrupt in on endpoint %u\n", i);
+			epds->interrupt_in[epds->num_interrupt_in++] = epd;
+		} else if (usb_endpoint_is_int_out(epd)) {
+			dev_dbg(dev, "found interrupt out on endpoint %u\n", i);
+			epds->interrupt_out[epds->num_interrupt_out++] = epd;
+		}
+	}
+}
+
 static int usb_serial_probe(struct usb_interface *interface,
 			       const struct usb_device_id *id)
 {
@@ -717,23 +749,15 @@ static int usb_serial_probe(struct usb_interface *interface,
 	struct usb_device *dev = interface_to_usbdev(interface);
 	struct usb_serial *serial = NULL;
 	struct usb_serial_port *port;
-	struct usb_host_interface *iface_desc;
 	struct usb_endpoint_descriptor *endpoint;
-	struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
-	struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
-	struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
-	struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
+	struct usb_serial_endpoints *epds;
 	struct usb_serial_driver *type = NULL;
 	int retval;
 	int buffer_size;
 	int i;
 	int j;
-	int num_interrupt_in = 0;
-	int num_interrupt_out = 0;
-	int num_bulk_in = 0;
-	int num_bulk_out = 0;
 	int num_ports = 0;
-	int max_endpoints;
+	unsigned char max_endpoints;
 
 	mutex_lock(&table_lock);
 	type = search_serial_device(interface);
@@ -752,8 +776,8 @@ static int usb_serial_probe(struct usb_interface *interface,
 
 	serial = create_serial(dev, interface, type);
 	if (!serial) {
-		module_put(type->driver.owner);
-		return -ENOMEM;
+		retval = -ENOMEM;
+		goto err_put_module;
 	}
 
 	/* if this device type has a probe function, call it */
@@ -765,129 +789,48 @@ static int usb_serial_probe(struct usb_interface *interface,
 
 		if (retval) {
 			dev_dbg(ddev, "sub driver rejected device\n");
-			usb_serial_put(serial);
-			module_put(type->driver.owner);
-			return retval;
+			goto err_put_serial;
 		}
 	}
 
 	/* descriptor matches, let's find the endpoints needed */
-	/* check out the endpoints */
-	iface_desc = interface->cur_altsetting;
-	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
-		endpoint = &iface_desc->endpoint[i].desc;
-
-		if (usb_endpoint_is_bulk_in(endpoint)) {
-			/* we found a bulk in endpoint */
-			dev_dbg(ddev, "found bulk in on endpoint %d\n", i);
-			if (num_bulk_in < MAX_NUM_PORTS) {
-				bulk_in_endpoint[num_bulk_in] = endpoint;
-				++num_bulk_in;
-			}
-		}
-
-		if (usb_endpoint_is_bulk_out(endpoint)) {
-			/* we found a bulk out endpoint */
-			dev_dbg(ddev, "found bulk out on endpoint %d\n", i);
-			if (num_bulk_out < MAX_NUM_PORTS) {
-				bulk_out_endpoint[num_bulk_out] = endpoint;
-				++num_bulk_out;
-			}
-		}
-
-		if (usb_endpoint_is_int_in(endpoint)) {
-			/* we found a interrupt in endpoint */
-			dev_dbg(ddev, "found interrupt in on endpoint %d\n", i);
-			if (num_interrupt_in < MAX_NUM_PORTS) {
-				interrupt_in_endpoint[num_interrupt_in] =
-						endpoint;
-				++num_interrupt_in;
-			}
-		}
-
-		if (usb_endpoint_is_int_out(endpoint)) {
-			/* we found an interrupt out endpoint */
-			dev_dbg(ddev, "found interrupt out on endpoint %d\n", i);
-			if (num_interrupt_out < MAX_NUM_PORTS) {
-				interrupt_out_endpoint[num_interrupt_out] =
-						endpoint;
-				++num_interrupt_out;
-			}
-		}
+	epds = kzalloc(sizeof(*epds), GFP_KERNEL);
+	if (!epds) {
+		retval = -ENOMEM;
+		goto err_put_serial;
 	}
 
-#if IS_ENABLED(CONFIG_USB_SERIAL_PL2303)
-	/* BEGIN HORRIBLE HACK FOR PL2303 */
-	/* this is needed due to the looney way its endpoints are set up */
-	if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
-	     (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
-	    ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
-	     (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
-	    ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
-	     (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
-	    ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
-	     (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
-		if (interface != dev->actconfig->interface[0]) {
-			/* check out the endpoints of the other interface*/
-			iface_desc = dev->actconfig->interface[0]->cur_altsetting;
-			for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
-				endpoint = &iface_desc->endpoint[i].desc;
-				if (usb_endpoint_is_int_in(endpoint)) {
-					/* we found a interrupt in endpoint */
-					dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n");
-					if (num_interrupt_in < MAX_NUM_PORTS) {
-						interrupt_in_endpoint[num_interrupt_in] = endpoint;
-						++num_interrupt_in;
-					}
-				}
-			}
-		}
+	find_endpoints(serial, epds);
 
-		/* Now make sure the PL-2303 is configured correctly.
-		 * If not, give up now and hope this hack will work
-		 * properly during a later invocation of usb_serial_probe
-		 */
-		if (num_bulk_in == 0 || num_bulk_out == 0) {
-			dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n");
-			usb_serial_put(serial);
-			module_put(type->driver.owner);
-			return -ENODEV;
-		}
-	}
-	/* END HORRIBLE HACK FOR PL2303 */
-#endif
-
-#ifdef CONFIG_USB_SERIAL_GENERIC
-	if (type == &usb_serial_generic_device) {
-		num_ports = num_bulk_out;
-		if (num_ports == 0) {
-			dev_err(ddev, "Generic device with no bulk out, not allowed.\n");
-			usb_serial_put(serial);
-			module_put(type->driver.owner);
-			return -EIO;
-		}
-		dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
-		dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
+	if (epds->num_bulk_in < type->num_bulk_in ||
+			epds->num_bulk_out < type->num_bulk_out ||
+			epds->num_interrupt_in < type->num_interrupt_in ||
+			epds->num_interrupt_out < type->num_interrupt_out) {
+		dev_err(ddev, "required endpoints missing\n");
+		retval = -ENODEV;
+		goto err_free_epds;
 	}
-#endif
-	if (!num_ports) {
-		/* if this device type has a calc_num_ports function, call it */
-		if (type->calc_num_ports)
-			num_ports = type->calc_num_ports(serial);
-		if (!num_ports)
-			num_ports = type->num_ports;
+
+	if (type->calc_num_ports) {
+		retval = type->calc_num_ports(serial, epds);
+		if (retval < 0)
+			goto err_free_epds;
+		num_ports = retval;
 	}
 
+	if (!num_ports)
+		num_ports = type->num_ports;
+
 	if (num_ports > MAX_NUM_PORTS) {
 		dev_warn(ddev, "too many ports requested: %d\n", num_ports);
 		num_ports = MAX_NUM_PORTS;
 	}
 
-	serial->num_ports = num_ports;
-	serial->num_bulk_in = num_bulk_in;
-	serial->num_bulk_out = num_bulk_out;
-	serial->num_interrupt_in = num_interrupt_in;
-	serial->num_interrupt_out = num_interrupt_out;
+	serial->num_ports = (unsigned char)num_ports;
+	serial->num_bulk_in = epds->num_bulk_in;
+	serial->num_bulk_out = epds->num_bulk_out;
+	serial->num_interrupt_in = epds->num_interrupt_in;
+	serial->num_interrupt_out = epds->num_interrupt_out;
 
 	/* found all that we need */
 	dev_info(ddev, "%s converter detected\n", type->description);
@@ -895,10 +838,10 @@ static int usb_serial_probe(struct usb_interface *interface,
 	/* create our ports, we need as many as the max endpoints */
 	/* we don't use num_ports here because some devices have more
 	   endpoint pairs than ports */
-	max_endpoints = max(num_bulk_in, num_bulk_out);
-	max_endpoints = max(max_endpoints, num_interrupt_in);
-	max_endpoints = max(max_endpoints, num_interrupt_out);
-	max_endpoints = max(max_endpoints, (int)serial->num_ports);
+	max_endpoints = max(epds->num_bulk_in, epds->num_bulk_out);
+	max_endpoints = max(max_endpoints, epds->num_interrupt_in);
+	max_endpoints = max(max_endpoints, epds->num_interrupt_out);
+	max_endpoints = max(max_endpoints, serial->num_ports);
 	serial->num_port_pointers = max_endpoints;
 
 	dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints);
@@ -923,8 +866,8 @@ static int usb_serial_probe(struct usb_interface *interface,
 	}
 
 	/* set up the endpoint information */
-	for (i = 0; i < num_bulk_in; ++i) {
-		endpoint = bulk_in_endpoint[i];
+	for (i = 0; i < epds->num_bulk_in; ++i) {
+		endpoint = epds->bulk_in[i];
 		port = serial->port[i];
 		buffer_size = max_t(int, serial->type->bulk_in_size,
 				usb_endpoint_maxp(endpoint));
@@ -952,8 +895,8 @@ static int usb_serial_probe(struct usb_interface *interface,
 		port->bulk_in_buffer = port->bulk_in_buffers[0];
 	}
 
-	for (i = 0; i < num_bulk_out; ++i) {
-		endpoint = bulk_out_endpoint[i];
+	for (i = 0; i < epds->num_bulk_out; ++i) {
+		endpoint = epds->bulk_out[i];
 		port = serial->port[i];
 		if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
 			goto probe_error;
@@ -985,8 +928,8 @@ static int usb_serial_probe(struct usb_interface *interface,
 	}
 
 	if (serial->type->read_int_callback) {
-		for (i = 0; i < num_interrupt_in; ++i) {
-			endpoint = interrupt_in_endpoint[i];
+		for (i = 0; i < epds->num_interrupt_in; ++i) {
+			endpoint = epds->interrupt_in[i];
 			port = serial->port[i];
 			port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 			if (!port->interrupt_in_urb)
@@ -1005,13 +948,13 @@ static int usb_serial_probe(struct usb_interface *interface,
 				serial->type->read_int_callback, port,
 				endpoint->bInterval);
 		}
-	} else if (num_interrupt_in) {
+	} else if (epds->num_interrupt_in) {
 		dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
 	}
 
 	if (serial->type->write_int_callback) {
-		for (i = 0; i < num_interrupt_out; ++i) {
-			endpoint = interrupt_out_endpoint[i];
+		for (i = 0; i < epds->num_interrupt_out; ++i) {
+			endpoint = epds->interrupt_out[i];
 			port = serial->port[i];
 			port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
 			if (!port->interrupt_out_urb)
@@ -1031,7 +974,7 @@ static int usb_serial_probe(struct usb_interface *interface,
 				serial->type->write_int_callback, port,
 				endpoint->bInterval);
 		}
-	} else if (num_interrupt_out) {
+	} else if (epds->num_interrupt_out) {
 		dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
 	}
 
@@ -1053,12 +996,6 @@ static int usb_serial_probe(struct usb_interface *interface,
 		serial->attached = 1;
 	}
 
-	/* Avoid race with tty_open and serial_install by setting the
-	 * disconnected flag and not clearing it until all ports have been
-	 * registered.
-	 */
-	serial->disconnected = 1;
-
 	if (allocate_minors(serial, num_ports)) {
 		dev_err(ddev, "No more free serial minor numbers\n");
 		goto probe_error;
@@ -1076,18 +1013,23 @@ static int usb_serial_probe(struct usb_interface *interface,
 			dev_err(ddev, "Error registering port device, continuing\n");
 	}
 
-	serial->disconnected = 0;
-
 	if (num_ports > 0)
 		usb_serial_console_init(serial->port[0]->minor);
 exit:
+	kfree(epds);
 	module_put(type->driver.owner);
 	return 0;
 
 probe_error:
+	retval = -EIO;
+err_free_epds:
+	kfree(epds);
+err_put_serial:
 	usb_serial_put(serial);
+err_put_module:
 	module_put(type->driver.owner);
-	return -EIO;
+
+	return retval;
 }
 
 static void usb_serial_disconnect(struct usb_interface *interface)
diff --git a/drivers/usb/serial/usb_debug.c b/drivers/usb/serial/usb_debug.c
index ca2fa5b..d210eff 100644
--- a/drivers/usb/serial/usb_debug.c
+++ b/drivers/usb/serial/usb_debug.c
@@ -17,7 +17,7 @@
 
 #define USB_DEBUG_MAX_PACKET_SIZE	8
 #define USB_DEBUG_BRK_SIZE		8
-static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
+static const char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
 	0x00,
 	0xff,
 	0x01,
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 337a0be..9f3317a 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -40,11 +40,12 @@ static int  visor_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void visor_close(struct usb_serial_port *port);
 static int  visor_probe(struct usb_serial *serial,
 					const struct usb_device_id *id);
-static int  visor_calc_num_ports(struct usb_serial *serial);
+static int  visor_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds);
+static int  clie_5_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds);
 static void visor_read_int_callback(struct urb *urb);
 static int  clie_3_5_startup(struct usb_serial *serial);
-static int  treo_attach(struct usb_serial *serial);
-static int clie_5_attach(struct usb_serial *serial);
 static int palm_os_3_probe(struct usb_serial *serial,
 					const struct usb_device_id *id);
 static int palm_os_4_probe(struct usb_serial *serial,
@@ -174,7 +175,6 @@ static struct usb_serial_driver handspring_device = {
 	.close =		visor_close,
 	.throttle =		usb_serial_generic_throttle,
 	.unthrottle =		usb_serial_generic_unthrottle,
-	.attach =		treo_attach,
 	.probe =		visor_probe,
 	.calc_num_ports =	visor_calc_num_ports,
 	.read_int_callback =	visor_read_int_callback,
@@ -189,14 +189,14 @@ static struct usb_serial_driver clie_5_device = {
 	.description =		"Sony Clie 5.0",
 	.id_table =		clie_id_5_table,
 	.num_ports =		2,
+	.num_bulk_out =		2,
 	.bulk_out_size =	256,
 	.open =			visor_open,
 	.close =		visor_close,
 	.throttle =		usb_serial_generic_throttle,
 	.unthrottle =		usb_serial_generic_unthrottle,
-	.attach =		clie_5_attach,
 	.probe =		visor_probe,
-	.calc_num_ports =	visor_calc_num_ports,
+	.calc_num_ports =	clie_5_calc_num_ports,
 	.read_int_callback =	visor_read_int_callback,
 };
 
@@ -466,16 +466,60 @@ static int visor_probe(struct usb_serial *serial,
 	return retval;
 }
 
-static int visor_calc_num_ports(struct usb_serial *serial)
+static int visor_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
+	unsigned int vid = le16_to_cpu(serial->dev->descriptor.idVendor);
 	int num_ports = (int)(long)(usb_get_serial_data(serial));
 
 	if (num_ports)
 		usb_set_serial_data(serial, NULL);
 
+	/*
+	 * Only swap the bulk endpoints for the Handspring devices with
+	 * interrupt in endpoints, which for now are the Treo devices.
+	 */
+	if (!(vid == HANDSPRING_VENDOR_ID || vid == KYOCERA_VENDOR_ID) ||
+			epds->num_interrupt_in == 0)
+		goto out;
+
+	if (epds->num_bulk_in < 2 || epds->num_interrupt_in < 2) {
+		dev_err(&serial->interface->dev, "missing endpoints\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * It appears that Treos and Kyoceras want to use the
+	 * 1st bulk in endpoint to communicate with the 2nd bulk out endpoint,
+	 * so let's swap the 1st and 2nd bulk in and interrupt endpoints.
+	 * Note that swapping the bulk out endpoints would break lots of
+	 * apps that want to communicate on the second port.
+	 */
+	swap(epds->bulk_in[0], epds->bulk_in[1]);
+	swap(epds->interrupt_in[0], epds->interrupt_in[1]);
+out:
 	return num_ports;
 }
 
+static int clie_5_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
+{
+	/*
+	 * TH55 registers 2 ports.
+	 * Communication in from the UX50/TH55 uses the first bulk-in
+	 * endpoint, while communication out to the UX50/TH55 uses the second
+	 * bulk-out endpoint.
+	 */
+
+	/*
+	 * FIXME: Should we swap the descriptors instead of using the same
+	 *        bulk-out endpoint for both ports?
+	 */
+	epds->bulk_out[0] = epds->bulk_out[1];
+
+	return serial->type->num_ports;
+}
+
 static int clie_3_5_startup(struct usb_serial *serial)
 {
 	struct device *dev = &serial->dev->dev;
@@ -531,94 +575,6 @@ out:
 	return result;
 }
 
-static int treo_attach(struct usb_serial *serial)
-{
-	struct usb_serial_port *swap_port;
-
-	/* Only do this endpoint hack for the Handspring devices with
-	 * interrupt in endpoints, which for now are the Treo devices. */
-	if (!((le16_to_cpu(serial->dev->descriptor.idVendor)
-						== HANDSPRING_VENDOR_ID) ||
-		(le16_to_cpu(serial->dev->descriptor.idVendor)
-						== KYOCERA_VENDOR_ID)) ||
-		(serial->num_interrupt_in == 0))
-		return 0;
-
-	if (serial->num_bulk_in < 2 || serial->num_interrupt_in < 2) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
-
-	/*
-	* It appears that Treos and Kyoceras want to use the
-	* 1st bulk in endpoint to communicate with the 2nd bulk out endpoint,
-	* so let's swap the 1st and 2nd bulk in and interrupt endpoints.
-	* Note that swapping the bulk out endpoints would break lots of
-	* apps that want to communicate on the second port.
-	*/
-#define COPY_PORT(dest, src)						\
-	do { \
-		int i;							\
-									\
-		for (i = 0; i < ARRAY_SIZE(src->read_urbs); ++i) {	\
-			dest->read_urbs[i] = src->read_urbs[i];		\
-			dest->read_urbs[i]->context = dest;		\
-			dest->bulk_in_buffers[i] = src->bulk_in_buffers[i]; \
-		}							\
-		dest->read_urb = src->read_urb;				\
-		dest->bulk_in_endpointAddress = src->bulk_in_endpointAddress;\
-		dest->bulk_in_buffer = src->bulk_in_buffer;		\
-		dest->bulk_in_size = src->bulk_in_size;			\
-		dest->interrupt_in_urb = src->interrupt_in_urb;		\
-		dest->interrupt_in_urb->context = dest;			\
-		dest->interrupt_in_endpointAddress = \
-					src->interrupt_in_endpointAddress;\
-		dest->interrupt_in_buffer = src->interrupt_in_buffer;	\
-	} while (0);
-
-	swap_port = kmalloc(sizeof(*swap_port), GFP_KERNEL);
-	if (!swap_port)
-		return -ENOMEM;
-	COPY_PORT(swap_port, serial->port[0]);
-	COPY_PORT(serial->port[0], serial->port[1]);
-	COPY_PORT(serial->port[1], swap_port);
-	kfree(swap_port);
-
-	return 0;
-}
-
-static int clie_5_attach(struct usb_serial *serial)
-{
-	struct usb_serial_port *port;
-	unsigned int pipe;
-	int j;
-
-	/* TH55 registers 2 ports.
-	   Communication in from the UX50/TH55 uses bulk_in_endpointAddress
-	   from port 0. Communication out to the UX50/TH55 uses
-	   bulk_out_endpointAddress from port 1
-
-	   Lets do a quick and dirty mapping
-	 */
-
-	/* some sanity check */
-	if (serial->num_bulk_out < 2) {
-		dev_err(&serial->interface->dev, "missing bulk out endpoints\n");
-		return -ENODEV;
-	}
-
-	/* port 0 now uses the modified endpoint Address */
-	port = serial->port[0];
-	port->bulk_out_endpointAddress =
-				serial->port[1]->bulk_out_endpointAddress;
-
-	pipe = usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress);
-	for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j)
-		port->write_urbs[j]->pipe = pipe;
-
-	return 0;
-}
-
 module_usb_serial_driver(serial_drivers, id_table_combined);
 
 MODULE_AUTHOR(DRIVER_AUTHOR);
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 5ab65eb..55cebc1 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -80,8 +80,6 @@ static int  whiteheat_firmware_download(struct usb_serial *serial,
 static int  whiteheat_firmware_attach(struct usb_serial *serial);
 
 /* function prototypes for the Connect Tech WhiteHEAT serial converter */
-static int whiteheat_probe(struct usb_serial *serial,
-				const struct usb_device_id *id);
 static int  whiteheat_attach(struct usb_serial *serial);
 static void whiteheat_release(struct usb_serial *serial);
 static int  whiteheat_port_probe(struct usb_serial_port *port);
@@ -118,7 +116,8 @@ static struct usb_serial_driver whiteheat_device = {
 	.description =		"Connect Tech - WhiteHEAT",
 	.id_table =		id_table_std,
 	.num_ports =		4,
-	.probe =		whiteheat_probe,
+	.num_bulk_in =		5,
+	.num_bulk_out =		5,
 	.attach =		whiteheat_attach,
 	.release =		whiteheat_release,
 	.port_probe =		whiteheat_port_probe,
@@ -221,33 +220,6 @@ static int whiteheat_firmware_attach(struct usb_serial *serial)
  * Connect Tech's White Heat serial driver functions
  *****************************************************************************/
 
-static int whiteheat_probe(struct usb_serial *serial,
-				const struct usb_device_id *id)
-{
-	struct usb_host_interface *iface_desc;
-	struct usb_endpoint_descriptor *endpoint;
-	size_t num_bulk_in = 0;
-	size_t num_bulk_out = 0;
-	size_t min_num_bulk;
-	unsigned int i;
-
-	iface_desc = serial->interface->cur_altsetting;
-
-	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
-		endpoint = &iface_desc->endpoint[i].desc;
-		if (usb_endpoint_is_bulk_in(endpoint))
-			++num_bulk_in;
-		if (usb_endpoint_is_bulk_out(endpoint))
-			++num_bulk_out;
-	}
-
-	min_num_bulk = COMMAND_PORT + 1;
-	if (num_bulk_in < min_num_bulk || num_bulk_out < min_num_bulk)
-		return -ENODEV;
-
-	return 0;
-}
-
 static int whiteheat_attach(struct usb_serial *serial)
 {
 	struct usb_serial_port *command_port;