diff options
| author | Oliver Neukum <oliver@neukum.org> | 2009-10-07 11:01:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-09 22:52:09 +0200 |
| commit | a1c33952b729eba4cedb8dbe54765921f2b3062f (patch) | |
| tree | dbdf6757ee483ee07cede1fd340b27b8018a1bb7 /drivers/usb/serial/visor.c | |
| parent | USB: serial: fix assumption that throttle/unthrottle cannot sleep (diff) | |
| download | linux-a1c33952b729eba4cedb8dbe54765921f2b3062f.tar.xz linux-a1c33952b729eba4cedb8dbe54765921f2b3062f.zip | |
USB: serial: fix race between unthrottle and completion handler in visor
usb:usbserial:visor: fix race between unthrottle and completion handler
visor_unthrottle() mustn't resubmit the URB unconditionally
as the URB may still be running.
the same bug as opticon.
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/visor.c')
| -rw-r--r-- | drivers/usb/serial/visor.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c index b9341f0e452b..ad1f9232292d 100644 --- a/drivers/usb/serial/visor.c +++ b/drivers/usb/serial/visor.c @@ -595,20 +595,23 @@ static void visor_unthrottle(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct visor_private *priv = usb_get_serial_port_data(port); - int result; + int result, was_throttled; dbg("%s - port %d", __func__, port->number); spin_lock_irq(&priv->lock); priv->throttled = 0; + was_throttled = priv->actually_throttled; priv->actually_throttled = 0; spin_unlock_irq(&priv->lock); - port->read_urb->dev = port->serial->dev; - result = usb_submit_urb(port->read_urb, GFP_KERNEL); - if (result) - dev_err(&port->dev, - "%s - failed submitting read urb, error %d\n", + if (was_throttled) { + port->read_urb->dev = port->serial->dev; + result = usb_submit_urb(port->read_urb, GFP_KERNEL); + if (result) + dev_err(&port->dev, + "%s - failed submitting read urb, error %d\n", __func__, result); + } } static int palm_os_3_probe(struct usb_serial *serial, |