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| author | Oliver Neukum <oliver@neukum.org> | 2009-10-07 09:30:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-09 13:52:08 -0700 |
| commit | b2a5cf1bdc011f5474c72543f9d8116c0f07f452 (patch) | |
| tree | 2e96220f14121811132d3cded43127ed52a13c8a | |
| parent | 88fa6590b30ef8c4d41923449ada104f915d8df8 (diff) | |
| download | linux-b2a5cf1bdc011f5474c72543f9d8116c0f07f452.tar.gz linux-b2a5cf1bdc011f5474c72543f9d8116c0f07f452.tar.bz2 linux-b2a5cf1bdc011f5474c72543f9d8116c0f07f452.zip | |
USB: serial: fix race between unthrottle and completion handler in symbolserial
usb:usbserial:symbolserial: fix race between unthrottle and completion handler
symbol_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>
| -rw-r--r-- | drivers/usb/serial/symbolserial.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/usb/serial/symbolserial.c b/drivers/usb/serial/symbolserial.c index cb7e95f9fcbf..f25e54526843 100644 --- a/drivers/usb/serial/symbolserial.c +++ b/drivers/usb/serial/symbolserial.c @@ -179,20 +179,24 @@ static void symbol_unthrottle(struct tty_struct *tty) struct symbol_private *priv = usb_get_serial_data(port->serial); unsigned long flags; int result; + bool 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->int_urb->dev = port->serial->dev; - result = usb_submit_urb(priv->int_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->int_urb, GFP_ATOMIC); + if (result) + dev_err(&port->dev, + "%s - failed submitting read urb, error %d\n", __func__, result); + } } static int symbol_startup(struct usb_serial *serial) |