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pkt_sched: Use qdisc_lock() on already sampled root qdisc.

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Based upon a bug report by Jeff Kirsher.

Don't use qdisc_root_lock() in these cases as the root
qdisc could have been changed, and we'd thus lock the
wrong object.

Tested by Emil S Tantilov who confirms that this seems
to fix the problem.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2008-08-02 20:02:43 -07:00
parent 82f97b8d3c
commit 5fb662297b
2 changed files with 8 additions and 8 deletions
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4
net/core/dev.c
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@@ -1796,7 +1796,7 @@ gso:
skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
#endif
if (q->enqueue) {
spinlock_t *root_lock = qdisc_root_lock(q);
spinlock_t *root_lock = qdisc_lock(q);
spin_lock(root_lock);
@@ -1995,7 +1995,7 @@ static void net_tx_action(struct softirq_action *h)
smp_mb__before_clear_bit();
clear_bit(__QDISC_STATE_SCHED, &q->state);
root_lock = qdisc_root_lock(q);
root_lock = qdisc_lock(q);
if (spin_trylock(root_lock)) {
qdisc_run(q);
spin_unlock(root_lock);