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authorJarek Poplawski <jarkao2@gmail.com>2008-09-07 18:41:21 -0700
committerDavid S. Miller <davem@davemloft.net>2008-09-07 18:41:21 -0700
commite8a83e10d7dfe5d0841062780769b30f65417e15 (patch)
treebc7069b34bb3173970ec06690323a1ab0f89ff56
parente3b802ba885b54f4050164c3cfd9e0ba9c73173a (diff)
pkt_sched: Fix qdisc state in net_tx_action()
net_tx_action() can skip __QDISC_STATE_SCHED bit clearing while qdisc is neither ran nor rescheduled, which may cause endless loop in dev_deactivate(). Reported-by: Denys Fedoryshchenko <denys@visp.net.lb> Tested-by: Denys Fedoryshchenko <denys@visp.net.lb> Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/dev.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 60c51f765887..e719ed29310f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1991,8 +1991,13 @@ static void net_tx_action(struct softirq_action *h)
spin_unlock(root_lock);
} else {
if (!test_bit(__QDISC_STATE_DEACTIVATED,
- &q->state))
+ &q->state)) {
__netif_reschedule(q);
+ } else {
+ smp_mb__before_clear_bit();
+ clear_bit(__QDISC_STATE_SCHED,
+ &q->state);
+ }
}
}
}

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