diff options
| author | Oliver Neukum <oliver@neukum.org> | 2009-10-07 09:25:10 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-09 13:52:08 -0700 |
| commit | 88fa6590b30ef8c4d41923449ada104f915d8df8 (patch) | |
| tree | c234aed89fa1c94b8115e6a6cb5eb9433357a52c | |
| parent | d55500941fe6db4d7424c744522ee2451ac1ceda (diff) | |
USB: serial: fix race between unthrottle and completion handler in opticon
usb:usbserial:opticon: fix race between unthrottle and completion handler
opticon_unthrottle() mustn't resubmit the URB unconditionally
as the URB may still be running.
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/serial/opticon.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c index 1085a577c5c..80f59b6350c 100644 --- a/drivers/usb/serial/opticon.c +++ b/drivers/usb/serial/opticon.c @@ -314,21 +314,24 @@ static void opticon_unthrottle(struct tty_struct *tty) struct usb_serial_port *port = tty->driver_data; struct opticon_private *priv = usb_get_serial_data(port->serial); unsigned long flags; - int result; + int result, was_throttled; dbg("%s - port %d", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); priv->throttled = false; + was_throttled = priv->actually_throttled; priv->actually_throttled = false; spin_unlock_irqrestore(&priv->lock, flags); priv->bulk_read_urb->dev = port->serial->dev; - result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC); - if (result) - dev_err(&port->dev, - "%s - failed submitting read urb, error %d\n", + if (was_throttled) { + result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC); + if (result) + dev_err(&port->dev, + "%s - failed submitting read urb, error %d\n", __func__, result); + } } static int opticon_tiocmget(struct tty_struct *tty, struct file *file) |