usbnet: Stop RX Q on MTU change
When MTU is changed unlink_urbs() flushes RX Q but mean while usbnet_bh() can fill up the Q at the same time. Depends on which HCD is down there unlink takes long time then the flush never ends. Signed-off-by: NSoohoon Lee <soohoon.lee@f5.com> Reviewed-by: NKimball Murray <kmurray@f5.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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