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rx_refill_timer should be deleted as soon as we disconnect from the backend since otherwise it is possible for the timer to go off before we get to xennet_destroy_queues(). If this happens we may dereference queue->rx.sring which is set to NULL in xennet_disconnect_backend(). Signed-off-by: Boris Ostrovsky <[email protected]> CC: [email protected] Reviewed-by: Juergen Gross <[email protected]> Signed-off-by: David S. Miller <[email protected]>