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authorDavid S. Miller <davem@davemloft.net>2008-08-02 20:02:43 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-02 20:02:43 -0700
commit5fb662297b8a4bdadd60371c34b760efca948ebc (patch)
treeef1def70cfa440ab3d367f6f67d466227ffdf0ef /net/core/dev.c
parent82f97b8d3cb3982ec97e081598c671fab2c321b0 (diff)
pkt_sched: Use qdisc_lock() on already sampled root qdisc.
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>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 69320a56a08..da7acacf02b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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);