[NET]: Stop polling when napi_disable() is pending.

This finally adds the code in net_rx_action() to break out of the
->poll()'ing loop when a napi_disable() is found to be pending.

Now, even if a device is being flooded with packets it can be cleanly
brought down.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index be9d3015beaa101318c58ce2827f5d96321de264..0879f52115eb9bada2f73bb3de2188ef9bf9a910 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2207,8 +2207,12 @@ static void net_rx_action(struct softirq_action *h)
                 * still "owns" the NAPI instance and therefore can
                 * move the instance around on the list at-will.
                 */
-               if (unlikely(work == weight))
-                       list_move_tail(&n->poll_list, list);
+               if (unlikely(work == weight)) {
+                       if (unlikely(napi_disable_pending(n)))
+                               __napi_complete(n);
+                       else
+                               list_move_tail(&n->poll_list, list);
+               }
 
                netpoll_poll_unlock(have);
        }