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netpoll_poll_lock() synchronizes the ->poll() invocation code paths, but once we have the lock we have to make sure that NAPI_STATE_SCHED is still set. Otherwise we get: cpu 0 cpu 1 net_rx_action() poll_napi() netpoll_poll_lock() ... spin on ->poll_lock ->poll() netif_rx_complete netpoll_poll_unlock() acquire ->poll_lock() ->poll() netif_rx_complete() CRASH Based upon a bug report from Tina Yang. Signed-off-by: David S. Miller <davem@davemloft.net>