diff options
Diffstat (limited to 'drivers/usb/serial/usb-serial.c')
-rw-r--r-- | drivers/usb/serial/usb-serial.c | 58 |
1 files changed, 38 insertions, 20 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 9c36f0e..a30135c 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -162,12 +162,19 @@ static void destroy_serial(struct kref *kref) } } + flush_scheduled_work(); /* port->work */ + usb_put_dev(serial->dev); /* free up any memory that we allocated */ kfree (serial); } +void usb_serial_put(struct usb_serial *serial) +{ + kref_put(&serial->kref, destroy_serial); +} + /***************************************************************************** * Driver tty interface functions *****************************************************************************/ @@ -201,12 +208,12 @@ static int serial_open (struct tty_struct *tty, struct file * filp) ++port->open_count; - if (port->open_count == 1) { + /* set up our port structure making the tty driver + * remember our port object, and us it */ + tty->driver_data = port; + port->tty = tty; - /* set up our port structure making the tty driver - * remember our port object, and us it */ - tty->driver_data = port; - port->tty = tty; + if (port->open_count == 1) { /* lock this module before we call it * this may fail, which means we must bail out, @@ -230,9 +237,11 @@ bailout_module_put: module_put(serial->type->driver.owner); bailout_mutex_unlock: port->open_count = 0; + tty->driver_data = NULL; + port->tty = NULL; mutex_unlock(&port->mutex); bailout_kref_put: - kref_put(&serial->kref, destroy_serial); + usb_serial_put(serial); return retval; } @@ -268,7 +277,7 @@ static void serial_close(struct tty_struct *tty, struct file * filp) } mutex_unlock(&port->mutex); - kref_put(&port->serial->kref, destroy_serial); + usb_serial_put(port->serial); } static int serial_write (struct tty_struct * tty, const unsigned char *buf, int count) @@ -276,7 +285,7 @@ static int serial_write (struct tty_struct * tty, const unsigned char *buf, int struct usb_serial_port *port = tty->driver_data; int retval = -EINVAL; - if (!port) + if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED) goto exit; dbg("%s - port %d, %d byte(s)", __FUNCTION__, port->number, count); @@ -296,7 +305,7 @@ exit: static int serial_write_room (struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; - int retval = -EINVAL; + int retval = -ENODEV; if (!port) goto exit; @@ -318,7 +327,7 @@ exit: static int serial_chars_in_buffer (struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; - int retval = -EINVAL; + int retval = -ENODEV; if (!port) goto exit; @@ -473,7 +482,7 @@ static int serial_read_proc (char *page, char **start, off_t off, int count, int begin += length; length = 0; } - kref_put(&serial->kref, destroy_serial); + usb_serial_put(serial); } *eof = 1; done: @@ -488,19 +497,18 @@ static int serial_tiocmget (struct tty_struct *tty, struct file *file) struct usb_serial_port *port = tty->driver_data; if (!port) - goto exit; + return -ENODEV; dbg("%s - port %d", __FUNCTION__, port->number); if (!port->open_count) { dbg("%s - port not open", __FUNCTION__); - goto exit; + return -ENODEV; } if (port->serial->type->tiocmget) return port->serial->type->tiocmget(port, file); -exit: return -EINVAL; } @@ -510,23 +518,32 @@ static int serial_tiocmset (struct tty_struct *tty, struct file *file, struct usb_serial_port *port = tty->driver_data; if (!port) - goto exit; + return -ENODEV; dbg("%s - port %d", __FUNCTION__, port->number); if (!port->open_count) { dbg("%s - port not open", __FUNCTION__); - goto exit; + return -ENODEV; } if (port->serial->type->tiocmset) return port->serial->type->tiocmset(port, file, set, clear); -exit: return -EINVAL; } -void usb_serial_port_softint(void *private) +/* + * We would be calling tty_wakeup here, but unfortunately some line + * disciplines have an annoying habit of calling tty->write from + * the write wakeup callback (e.g. n_hdlc.c). + */ +void usb_serial_port_softint(struct usb_serial_port *port) +{ + schedule_work(&port->work); +} + +static void usb_serial_port_work(void *private) { struct usb_serial_port *port = private; struct tty_struct *tty; @@ -789,7 +806,7 @@ int usb_serial_probe(struct usb_interface *interface, port->serial = serial; spin_lock_init(&port->lock); mutex_init(&port->mutex); - INIT_WORK(&port->work, usb_serial_port_softint, port); + INIT_WORK(&port->work, usb_serial_port_work, port); serial->port[i] = port; } @@ -985,6 +1002,7 @@ void usb_serial_disconnect(struct usb_interface *interface) struct device *dev = &interface->dev; struct usb_serial_port *port; + usb_serial_console_disconnect(serial); dbg ("%s", __FUNCTION__); usb_set_intfdata (interface, NULL); @@ -996,7 +1014,7 @@ void usb_serial_disconnect(struct usb_interface *interface) } /* let the last holder of this object * cause it to be cleaned up */ - kref_put(&serial->kref, destroy_serial); + usb_serial_put(serial); } dev_info(dev, "device disconnected\n"); } |