USB: remove uses of URB_NO_SETUP_DMA_MAP

This patch (as1350) removes all usages of coherent buffers for USB
control-request setup-packet buffers.  There's no good reason to
reserve coherent memory for these things; control requests are hardly
ever used in large quantity (the major exception is firmware
transfers, and they aren't time-critical).  Furthermore, only seven
drivers used it.  We might as well always use streaming DMA mappings
for setup-packet buffers, and remove some extra complexity from
usbcore.

The DMA-mapping portion of hcd.c is currently in flux.  A separate
patch will be submitted to remove support for URB_NO_SETUP_DMA_MAP
after everything else settles down.  The removal should go smoothly,
as by then nobody will be using it.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

13 files changed, 27 insertions, 75 deletions

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 7b85b69..6a510c9 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -787,8 +787,7 @@ static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
 			&usbhid->inbuf_dma);
 	usbhid->outbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_KERNEL,
 			&usbhid->outbuf_dma);
-	usbhid->cr = usb_buffer_alloc(dev, sizeof(*usbhid->cr), GFP_KERNEL,
-			&usbhid->cr_dma);
+	usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
 	usbhid->ctrlbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_KERNEL,
 			&usbhid->ctrlbuf_dma);
 	if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
@@ -846,7 +845,7 @@ static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
 
 	usb_buffer_free(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
 	usb_buffer_free(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
-	usb_buffer_free(dev, sizeof(*(usbhid->cr)), usbhid->cr, usbhid->cr_dma);
+	kfree(usbhid->cr);
 	usb_buffer_free(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
 }
 
@@ -1007,9 +1006,8 @@ static int usbhid_start(struct hid_device *hid)
 
 	usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
 			     usbhid->ctrlbuf, 1, hid_ctrl, hid);
-	usbhid->urbctrl->setup_dma = usbhid->cr_dma;
 	usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
-	usbhid->urbctrl->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP);
+	usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 
 	if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
 		usbhid_init_reports(hid);
diff --git a/drivers/hid/usbhid/usbhid.h b/drivers/hid/usbhid/usbhid.h
index ec20400..693fd3e 100644
--- a/drivers/hid/usbhid/usbhid.h
+++ b/drivers/hid/usbhid/usbhid.h
@@ -75,7 +75,6 @@ struct usbhid_device {
 
 	struct urb *urbctrl;                                            /* Control URB */
 	struct usb_ctrlrequest *cr;                                     /* Control request struct */
-	dma_addr_t cr_dma;                                              /* Control request struct dma */
 	struct hid_control_fifo ctrl[HID_CONTROL_FIFO_SIZE];  		/* Control fifo */
 	unsigned char ctrlhead, ctrltail;                               /* Control fifo head & tail */
 	char *ctrlbuf;                                                  /* Control buffer */
diff --git a/drivers/hid/usbhid/usbkbd.c b/drivers/hid/usbhid/usbkbd.c
index f843443..bdc7b09 100644
--- a/drivers/hid/usbhid/usbkbd.c
+++ b/drivers/hid/usbhid/usbkbd.c
@@ -74,7 +74,6 @@ struct usb_kbd {
 	unsigned char *new;
 	struct usb_ctrlrequest *cr;
 	unsigned char *leds;
-	dma_addr_t cr_dma;
 	dma_addr_t new_dma;
 	dma_addr_t leds_dma;
 };
@@ -199,7 +198,7 @@ static int usb_kbd_alloc_mem(struct usb_device *dev, struct usb_kbd *kbd)
 		return -1;
 	if (!(kbd->new = usb_buffer_alloc(dev, 8, GFP_ATOMIC, &kbd->new_dma)))
 		return -1;
-	if (!(kbd->cr = usb_buffer_alloc(dev, sizeof(struct usb_ctrlrequest), GFP_ATOMIC, &kbd->cr_dma)))
+	if (!(kbd->cr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 		return -1;
 	if (!(kbd->leds = usb_buffer_alloc(dev, 1, GFP_ATOMIC, &kbd->leds_dma)))
 		return -1;
@@ -212,7 +211,7 @@ static void usb_kbd_free_mem(struct usb_device *dev, struct usb_kbd *kbd)
 	usb_free_urb(kbd->irq);
 	usb_free_urb(kbd->led);
 	usb_buffer_free(dev, 8, kbd->new, kbd->new_dma);
-	usb_buffer_free(dev, sizeof(struct usb_ctrlrequest), kbd->cr, kbd->cr_dma);
+	kfree(kbd->cr);
 	usb_buffer_free(dev, 1, kbd->leds, kbd->leds_dma);
 }
 
@@ -304,9 +303,8 @@ static int usb_kbd_probe(struct usb_interface *iface,
 	usb_fill_control_urb(kbd->led, dev, usb_sndctrlpipe(dev, 0),
 			     (void *) kbd->cr, kbd->leds, 1,
 			     usb_kbd_led, kbd);
-	kbd->led->setup_dma = kbd->cr_dma;
 	kbd->led->transfer_dma = kbd->leds_dma;
-	kbd->led->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP);
+	kbd->led->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 
 	error = input_register_device(kbd->dev);
 	if (error)
diff --git a/drivers/input/misc/cm109.c b/drivers/input/misc/cm109.c
index 86457fe..8d2d291 100644
--- a/drivers/input/misc/cm109.c
+++ b/drivers/input/misc/cm109.c
@@ -102,7 +102,6 @@ struct cm109_dev {
 	struct cm109_ctl_packet *ctl_data;
 	dma_addr_t ctl_dma;
 	struct usb_ctrlrequest *ctl_req;
-	dma_addr_t ctl_req_dma;
 	struct urb *urb_ctl;
 	/*
 	 * The 3 bitfields below are protected by ctl_submit_lock.
@@ -629,9 +628,7 @@ static const struct usb_device_id cm109_usb_table[] = {
 
 static void cm109_usb_cleanup(struct cm109_dev *dev)
 {
-	if (dev->ctl_req)
-		usb_buffer_free(dev->udev, sizeof(*(dev->ctl_req)),
-				dev->ctl_req, dev->ctl_req_dma);
+	kfree(dev->ctl_req);
 	if (dev->ctl_data)
 		usb_buffer_free(dev->udev, USB_PKT_LEN,
 				dev->ctl_data, dev->ctl_dma);
@@ -696,8 +693,7 @@ static int cm109_usb_probe(struct usb_interface *intf,
 	if (!dev->ctl_data)
 		goto err_out;
 
-	dev->ctl_req = usb_buffer_alloc(udev, sizeof(*(dev->ctl_req)),
-					GFP_KERNEL, &dev->ctl_req_dma);
+	dev->ctl_req = kmalloc(sizeof(*(dev->ctl_req)), GFP_KERNEL);
 	if (!dev->ctl_req)
 		goto err_out;
 
@@ -735,10 +731,8 @@ static int cm109_usb_probe(struct usb_interface *intf,
 	usb_fill_control_urb(dev->urb_ctl, udev, usb_sndctrlpipe(udev, 0),
 			     (void *)dev->ctl_req, dev->ctl_data, USB_PKT_LEN,
 			     cm109_urb_ctl_callback, dev);
-	dev->urb_ctl->setup_dma = dev->ctl_req_dma;
 	dev->urb_ctl->transfer_dma = dev->ctl_dma;
-	dev->urb_ctl->transfer_flags |= URB_NO_SETUP_DMA_MAP |
-					URB_NO_TRANSFER_DMA_MAP;
+	dev->urb_ctl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 	dev->urb_ctl->dev = udev;
 
 	/* find out the physical bus location */
diff --git a/drivers/input/misc/powermate.c b/drivers/input/misc/powermate.c
index 668913d..7ba4b5f 100644
--- a/drivers/input/misc/powermate.c
+++ b/drivers/input/misc/powermate.c
@@ -64,7 +64,6 @@ struct powermate_device {
 	dma_addr_t data_dma;
 	struct urb *irq, *config;
 	struct usb_ctrlrequest *configcr;
-	dma_addr_t configcr_dma;
 	struct usb_device *udev;
 	struct input_dev *input;
 	spinlock_t lock;
@@ -182,8 +181,6 @@ static void powermate_sync_state(struct powermate_device *pm)
 	usb_fill_control_urb(pm->config, pm->udev, usb_sndctrlpipe(pm->udev, 0),
 			     (void *) pm->configcr, NULL, 0,
 			     powermate_config_complete, pm);
-	pm->config->setup_dma = pm->configcr_dma;
-	pm->config->transfer_flags |= URB_NO_SETUP_DMA_MAP;
 
 	if (usb_submit_urb(pm->config, GFP_ATOMIC))
 		printk(KERN_ERR "powermate: usb_submit_urb(config) failed");
@@ -281,8 +278,7 @@ static int powermate_alloc_buffers(struct usb_device *udev, struct powermate_dev
 	if (!pm->data)
 		return -1;
 
-	pm->configcr = usb_buffer_alloc(udev, sizeof(*(pm->configcr)),
-					GFP_ATOMIC, &pm->configcr_dma);
+	pm->configcr = kmalloc(sizeof(*(pm->configcr)), GFP_KERNEL);
 	if (!pm->configcr)
 		return -1;
 
@@ -293,8 +289,7 @@ static void powermate_free_buffers(struct usb_device *udev, struct powermate_dev
 {
 	usb_buffer_free(udev, POWERMATE_PAYLOAD_SIZE_MAX,
 			pm->data, pm->data_dma);
-	usb_buffer_free(udev, sizeof(*(pm->configcr)),
-			pm->configcr, pm->configcr_dma);
+	kfree(pm->configcr);
 }
 
 /* Called whenever a USB device matching one in our supported devices table is connected */
diff --git a/drivers/input/misc/yealink.c b/drivers/input/misc/yealink.c
index 93a22ac..2828328 100644
--- a/drivers/input/misc/yealink.c
+++ b/drivers/input/misc/yealink.c
@@ -111,7 +111,6 @@ struct yealink_dev {
 	struct yld_ctl_packet	*ctl_data;
 	dma_addr_t		ctl_dma;
 	struct usb_ctrlrequest	*ctl_req;
-	dma_addr_t		ctl_req_dma;
 	struct urb		*urb_ctl;
 
 	char phys[64];			/* physical device path */
@@ -836,8 +835,7 @@ static int usb_cleanup(struct yealink_dev *yld, int err)
 	usb_free_urb(yld->urb_irq);
 	usb_free_urb(yld->urb_ctl);
 
-	usb_buffer_free(yld->udev, sizeof(*(yld->ctl_req)),
-			yld->ctl_req, yld->ctl_req_dma);
+	kfree(yld->ctl_req);
 	usb_buffer_free(yld->udev, USB_PKT_LEN,
 			yld->ctl_data, yld->ctl_dma);
 	usb_buffer_free(yld->udev, USB_PKT_LEN,
@@ -896,8 +894,7 @@ static int usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	if (!yld->ctl_data)
 		return usb_cleanup(yld, -ENOMEM);
 
-	yld->ctl_req = usb_buffer_alloc(udev, sizeof(*(yld->ctl_req)),
-					GFP_ATOMIC, &yld->ctl_req_dma);
+	yld->ctl_req = kmalloc(sizeof(*(yld->ctl_req)), GFP_KERNEL);
 	if (yld->ctl_req == NULL)
 		return usb_cleanup(yld, -ENOMEM);
 
@@ -936,10 +933,8 @@ static int usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	usb_fill_control_urb(yld->urb_ctl, udev, usb_sndctrlpipe(udev, 0),
 			(void *)yld->ctl_req, yld->ctl_data, USB_PKT_LEN,
 			urb_ctl_callback, yld);
-	yld->urb_ctl->setup_dma	= yld->ctl_req_dma;
 	yld->urb_ctl->transfer_dma	= yld->ctl_dma;
-	yld->urb_ctl->transfer_flags	|= URB_NO_SETUP_DMA_MAP |
-					URB_NO_TRANSFER_DMA_MAP;
+	yld->urb_ctl->transfer_flags	|= URB_NO_TRANSFER_DMA_MAP;
 	yld->urb_ctl->dev = udev;
 
 	/* find out the physical bus location */
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 09301f4..2532a09 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -396,8 +396,8 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 		return -EPIPE;		/* The most suitable error code :-) */
 
 	/* enforce simple/standard policy */
-	allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP |
-			URB_NO_INTERRUPT | URB_DIR_MASK | URB_FREE_BUFFER);
+	allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT | URB_DIR_MASK |
+			URB_FREE_BUFFER);
 	switch (xfertype) {
 	case USB_ENDPOINT_XFER_BULK:
 		if (is_out)
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 1088abb..097172e 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -775,7 +775,7 @@ EXPORT_SYMBOL_GPL(usb_free_coherent);
  * @urb: urb whose transfer_buffer/setup_packet will be mapped
  *
  * Return value is either null (indicating no buffer could be mapped), or
- * the parameter.  URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are
+ * the parameter.  URB_NO_TRANSFER_DMA_MAP is
  * added to urb->transfer_flags if the operation succeeds.  If the device
  * is connected to this system through a non-DMA controller, this operation
  * always succeeds.
@@ -803,17 +803,11 @@ struct urb *usb_buffer_map(struct urb *urb)
 			urb->transfer_buffer, urb->transfer_buffer_length,
 			usb_pipein(urb->pipe)
 				? DMA_FROM_DEVICE : DMA_TO_DEVICE);
-		if (usb_pipecontrol(urb->pipe))
-			urb->setup_dma = dma_map_single(controller,
-					urb->setup_packet,
-					sizeof(struct usb_ctrlrequest),
-					DMA_TO_DEVICE);
 	/* FIXME generic api broken like pci, can't report errors */
 	/* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */
 	} else
 		urb->transfer_dma = ~0;
-	urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP
-				| URB_NO_SETUP_DMA_MAP);
+	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 	return urb;
 }
 EXPORT_SYMBOL_GPL(usb_buffer_map);
@@ -881,14 +875,8 @@ void usb_buffer_unmap(struct urb *urb)
 			urb->transfer_dma, urb->transfer_buffer_length,
 			usb_pipein(urb->pipe)
 				? DMA_FROM_DEVICE : DMA_TO_DEVICE);
-		if (usb_pipecontrol(urb->pipe))
-			dma_unmap_single(controller,
-					urb->setup_dma,
-					sizeof(struct usb_ctrlrequest),
-					DMA_TO_DEVICE);
 	}
-	urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP
-				| URB_NO_SETUP_DMA_MAP);
+	urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP;
 }
 EXPORT_SYMBOL_GPL(usb_buffer_unmap);
 #endif  /*  0  */
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index a21cce6..9dcc823 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -977,15 +977,13 @@ test_ctrl_queue (struct usbtest_dev *dev, struct usbtest_param *param)
 		if (!u)
 			goto cleanup;
 
-		reqp = usb_buffer_alloc (udev, sizeof *reqp, GFP_KERNEL,
-				&u->setup_dma);
+		reqp = kmalloc(sizeof *reqp, GFP_KERNEL);
 		if (!reqp)
 			goto cleanup;
 		reqp->setup = req;
 		reqp->number = i % NUM_SUBCASES;
 		reqp->expected = expected;
 		u->setup_packet = (char *) &reqp->setup;
-		u->transfer_flags |= URB_NO_SETUP_DMA_MAP;
 
 		u->context = &context;
 		u->complete = ctrl_complete;
@@ -1017,10 +1015,7 @@ cleanup:
 		if (!urb [i])
 			continue;
 		urb [i]->dev = udev;
-		if (urb [i]->setup_packet)
-			usb_buffer_free (udev, sizeof (struct usb_ctrlrequest),
-					urb [i]->setup_packet,
-					urb [i]->setup_dma);
+		kfree(urb[i]->setup_packet);
 		simple_free_urb (urb [i]);
 	}
 	kfree (urb);
diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index f253ede..4471642 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -147,11 +147,9 @@ static int usb_stor_msg_common(struct us_data *us, int timeout)
 	 * hasn't been mapped for DMA.  Yes, this is clunky, but it's
 	 * easier than always having the caller tell us whether the
 	 * transfer buffer has already been mapped. */
-	us->current_urb->transfer_flags = URB_NO_SETUP_DMA_MAP;
 	if (us->current_urb->transfer_buffer == us->iobuf)
 		us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 	us->current_urb->transfer_dma = us->iobuf_dma;
-	us->current_urb->setup_dma = us->cr_dma;
 
 	/* submit the URB */
 	status = usb_submit_urb(us->current_urb, GFP_NOIO);
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index bbeeb92..c54a370 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -407,9 +407,8 @@ static int associate_dev(struct us_data *us, struct usb_interface *intf)
 	/* Store our private data in the interface */
 	usb_set_intfdata(intf, us);
 
-	/* Allocate the device-related DMA-mapped buffers */
-	us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
-			GFP_KERNEL, &us->cr_dma);
+	/* Allocate the control/setup and DMA-mapped buffers */
+	us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
 	if (!us->cr) {
 		US_DEBUGP("usb_ctrlrequest allocation failed\n");
 		return -ENOMEM;
@@ -757,13 +756,9 @@ static void dissociate_dev(struct us_data *us)
 {
 	US_DEBUGP("-- %s\n", __func__);
 
-	/* Free the device-related DMA-mapped buffers */
-	if (us->cr)
-		usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
-				us->cr_dma);
-	if (us->iobuf)
-		usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
-				us->iobuf_dma);
+	/* Free the buffers */
+	kfree(us->cr);
+	usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
 
 	/* Remove our private data from the interface */
 	usb_set_intfdata(us->pusb_intf, NULL);
diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h
index 6971713..89d3bff 100644
--- a/drivers/usb/storage/usb.h
+++ b/drivers/usb/storage/usb.h
@@ -139,8 +139,7 @@ struct us_data {
 	struct usb_ctrlrequest	*cr;		 /* control requests	 */
 	struct usb_sg_request	current_sg;	 /* scatter-gather req.  */
 	unsigned char		*iobuf;		 /* I/O buffer		 */
-	dma_addr_t		cr_dma;		 /* buffer DMA addresses */
-	dma_addr_t		iobuf_dma;
+	dma_addr_t		iobuf_dma;	 /* buffer DMA addresses */
 	struct task_struct	*ctl_thread;	 /* the control thread   */
 
 	/* mutual exclusion and synchronization structures */
diff --git a/drivers/usb/wusbcore/wa-xfer.c b/drivers/usb/wusbcore/wa-xfer.c
index 112ef7e..2ce6b7e 100644
--- a/drivers/usb/wusbcore/wa-xfer.c
+++ b/drivers/usb/wusbcore/wa-xfer.c
@@ -474,8 +474,6 @@ static void __wa_xfer_setup_hdr0(struct wa_xfer *xfer,
 		struct wa_xfer_ctl *xfer_ctl =
 			container_of(xfer_hdr0, struct wa_xfer_ctl, hdr);
 		xfer_ctl->bmAttribute = xfer->is_inbound ? 1 : 0;
-		BUG_ON(xfer->urb->transfer_flags & URB_NO_SETUP_DMA_MAP
-		       && xfer->urb->setup_packet == NULL);
 		memcpy(&xfer_ctl->baSetupData, xfer->urb->setup_packet,
 		       sizeof(xfer_ctl->baSetupData));
 		break;