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>

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);