net: Fix locking in flush_backlog
Need to take spinlocks when dequeuing from input_pkt_queue in flush_backlog. Also, flush_backlog can now be called directly from netdev_run_todo. Signed-off-by: Tom Herbert <therbert@google.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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