usb: cdc-wdm: Fix deadlock between write and resume

The new runtime PM scheme allows resume() to have no locks.
This fixes the deadlock.

Signed-off-by: Oliver Neukum <neukum@b1-systems.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index b574905..189141c 100644 (file)
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -839,10 +839,10 @@ static int wdm_resume(struct usb_interface *intf)
        int rv;
 
        dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
-       mutex_lock(&desc->lock);
+
        clear_bit(WDM_SUSPENDING, &desc->flags);
        rv = recover_from_urb_loss(desc);
-       mutex_unlock(&desc->lock);
+
        return rv;
 }
 #endif