diff options
| author | Bjørn Mork <bjorn@mork.no> | 2012-01-16 15:11:57 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-24 21:18:25 +0100 |
| commit | 62aaf24dc125d7c55c93e313d15611f152b030c7 (patch) | |
| tree | 53aa5c498a5ffae8c8c78bef3be0889c9af61bfd /drivers/usb | |
| parent | USB: cdc-wdm: use two mutexes to allow simultaneous read and write (diff) | |
| download | linux-62aaf24dc125d7c55c93e313d15611f152b030c7.tar.xz linux-62aaf24dc125d7c55c93e313d15611f152b030c7.zip | |
USB: cdc-wdm: call wake_up_all to allow driver to shutdown on device removal
wdm_disconnect() waits for the mutex held by wdm_read() before
calling wake_up_all(). This causes a deadlock, preventing device removal
to complete. Do the wake_up_all() before we start waiting for the locks.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/class/cdc-wdm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 023d271c2614..07aa67611b65 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -786,13 +786,13 @@ static void wdm_disconnect(struct usb_interface *intf) /* to terminate pending flushes */ clear_bit(WDM_IN_USE, &desc->flags); spin_unlock_irqrestore(&desc->iuspin, flags); + wake_up_all(&desc->wait); mutex_lock(&desc->rlock); mutex_lock(&desc->wlock); kill_urbs(desc); cancel_work_sync(&desc->rxwork); mutex_unlock(&desc->wlock); mutex_unlock(&desc->rlock); - wake_up_all(&desc->wait); if (!desc->count) cleanup(desc); mutex_unlock(&wdm_mutex); |