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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-05-10 14:12:47 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-05-10 23:47:42 -0700 |
| commit | 41a23b0788610b27ecb4c4ee857f3fe7168f1070 (patch) | |
| tree | 8f239d889253a7d7d9dd9f12bf4c76f7ff184274 /net/sched | |
| parent | cce1fa36a8ed36e8a3f64455e2a830f48e904c64 (diff) | |
| download | linux-3.10-41a23b0788610b27ecb4c4ee857f3fe7168f1070.tar.gz linux-3.10-41a23b0788610b27ecb4c4ee857f3fe7168f1070.tar.bz2 linux-3.10-41a23b0788610b27ecb4c4ee857f3fe7168f1070.zip | |
[NET_SCHED]: Avoid requeue warning on dev_deactivate
When we relinquish queue_lock in qdisc_restart and then retake it for
requeueing, we might race against dev_deactivate and end up requeueing
onto noop_qdisc. This causes a warning to be printed.
This patch fixes this by checking this before we requeue. As an added
bonus, we can remove the same check in __qdisc_run which was added to
prevent dev->gso_skb from being requeued when we're shutting down.
Even though we've had to add a new conditional in its place, it's better
because it only happens on requeues rather than every single time that
qdisc_run is called.
For this to work we also need to move the clearing of gso_skb up in
dev_deactivate as now qdisc_restart can occur even after we wait for
__LINK_STATE_QDISC_RUNNING to clear (but it won't do anything as long
as the queue and gso_skb is already clear).
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_generic.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 816d311db40..f28bb2dc58d 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -162,7 +162,9 @@ static inline int qdisc_restart(struct net_device *dev) */ requeue: - if (skb->next) + if (unlikely(q == &noop_qdisc)) + kfree_skb(skb); + else if (skb->next) dev->gso_skb = skb; else q->ops->requeue(skb, q); @@ -177,15 +179,11 @@ out: void __qdisc_run(struct net_device *dev) { - if (unlikely(dev->qdisc == &noop_qdisc)) - goto out; - do { if (!qdisc_restart(dev)) break; } while (!netif_queue_stopped(dev)); -out: clear_bit(__LINK_STATE_QDISC_RUNNING, &dev->state); } @@ -547,6 +545,7 @@ void dev_activate(struct net_device *dev) void dev_deactivate(struct net_device *dev) { struct Qdisc *qdisc; + struct sk_buff *skb; spin_lock_bh(&dev->queue_lock); qdisc = dev->qdisc; @@ -554,8 +553,12 @@ void dev_deactivate(struct net_device *dev) qdisc_reset(qdisc); + skb = dev->gso_skb; + dev->gso_skb = NULL; spin_unlock_bh(&dev->queue_lock); + kfree_skb(skb); + dev_watchdog_down(dev); /* Wait for outstanding dev_queue_xmit calls. */ @@ -564,11 +567,6 @@ void dev_deactivate(struct net_device *dev) /* Wait for outstanding qdisc_run calls. */ while (test_bit(__LINK_STATE_QDISC_RUNNING, &dev->state)) yield(); - - if (dev->gso_skb) { - kfree_skb(dev->gso_skb); - dev->gso_skb = NULL; - } } void dev_init_scheduler(struct net_device *dev) |