pkt_sched: Prevent livelock in TX queue running.

If dev_deactivate() is trying to quiesce the queue, it
is theoretically possible for another cpu to livelock
trying to process that queue.  This happens because
dev_deactivate() grabs the queue spinlock as it checks
the queue state, whereas net_tx_action() does a trylock
and reschedules the qdisc if it hits the lock.

This breaks the livelock by adding a check on
__QDISC_STATE_DEACTIVATED to net_tx_action() when
the trylock fails.

Based upon feedback from Herbert Xu and Jarek Poplawski.

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

1 files changed, 3 insertions, 1 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 8d133802372b..60c51f765887 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1990,7 +1990,9 @@ static void net_tx_action(struct softirq_action *h)
                                 qdisc_run(q);
                                 spin_unlock(root_lock);
                         } else {
-                                __netif_reschedule(q);
+                                if (!test_bit(__QDISC_STATE_DEACTIVATED,
+                                              &q->state))
+                                        __netif_reschedule(q);
                         }
                 }
         }