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authorThomas Graf <tgraf@suug.ch>2007-05-10 04:02:41 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-05-10 23:47:39 -0700
commit5830725f8a36908111ecccf2899d06d6dcf54d45 (patch)
tree5f06185bf908327f51e027ae35391215e6d80253 /net
parentfc038410b4b1643766f8033f4940bcdb1dace633 (diff)
downloadblackbird-obmc-linux-5830725f8a36908111ecccf2899d06d6dcf54d45.tar.gz
blackbird-obmc-linux-5830725f8a36908111ecccf2899d06d6dcf54d45.zip
[NET]: Fix dev->qdisc race for NETDEV_TX_LOCKED case
When transmit fails with NETDEV_TX_LOCKED the skb is requeued to dev->qdisc again. The dev->qdisc pointer is protected by the queue lock which needs to be dropped when attempting to transmit and acquired again before requeing. The problem is that qdisc_restart() fetches the dev->qdisc pointer once and stores it in the `q' variable which is invalidated when dropping the queue_lock, therefore the variable needs to be refreshed before requeueing. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/sch_generic.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 3385ee592541..a8240c578772 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -139,6 +139,7 @@ static inline int qdisc_restart(struct net_device *dev)
}
if (ret == NETDEV_TX_LOCKED && nolock) {
spin_lock(&dev->queue_lock);
+ q = dev->qdisc;
goto collision;
}
}
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