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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/sched
parent82f97b8d3cb3982ec97e081598c671fab2c321b0 (diff)
downloadop-kernel-dev-5fb662297b8a4bdadd60371c34b760efca948ebc.zip
op-kernel-dev-5fb662297b8a4bdadd60371c34b760efca948ebc.tar.gz
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/sched')
-rw-r--r--net/sched/sch_generic.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 9c9cd4d..7cf83b3 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -29,7 +29,7 @@
/* Main transmission queue. */
/* Modifications to data participating in scheduling must be protected with
- * qdisc_root_lock(qdisc) spinlock.
+ * qdisc_lock(qdisc) spinlock.
*
* The idea is the following:
* - enqueue, dequeue are serialized via qdisc root lock
@@ -126,7 +126,7 @@ static inline int qdisc_restart(struct Qdisc *q)
if (unlikely((skb = dequeue_skb(q)) == NULL))
return 0;
- root_lock = qdisc_root_lock(q);
+ root_lock = qdisc_lock(q);
/* And release qdisc */
spin_unlock(root_lock);
@@ -507,7 +507,7 @@ errout:
}
EXPORT_SYMBOL(qdisc_create_dflt);
-/* Under qdisc_root_lock(qdisc) and BH! */
+/* Under qdisc_lock(qdisc) and BH! */
void qdisc_reset(struct Qdisc *qdisc)
{
@@ -543,7 +543,7 @@ static void __qdisc_destroy(struct rcu_head *head)
kfree((char *) qdisc - qdisc->padded);
}
-/* Under qdisc_root_lock(qdisc) and BH! */
+/* Under qdisc_lock(qdisc) and BH! */
void qdisc_destroy(struct Qdisc *qdisc)
{
@@ -659,7 +659,7 @@ static bool some_qdisc_is_running(struct net_device *dev, int lock)
dev_queue = netdev_get_tx_queue(dev, i);
q = dev_queue->qdisc;
- root_lock = qdisc_root_lock(q);
+ root_lock = qdisc_lock(q);
if (lock)
spin_lock_bh(root_lock);
@@ -735,7 +735,7 @@ static void shutdown_scheduler_queue(struct net_device *dev,
struct Qdisc *qdisc_default = _qdisc_default;
if (qdisc) {
- spinlock_t *root_lock = qdisc_root_lock(qdisc);
+ spinlock_t *root_lock = qdisc_lock(qdisc);
dev_queue->qdisc = qdisc_default;
dev_queue->qdisc_sleeping = qdisc_default;
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