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| author | David S. Miller <davem@davemloft.net> | 2008-08-18 21:03:15 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-08-18 21:06:19 -0700 |
| commit | 4d8863a29c4755a0461cd31b6865026187d6c43a (patch) | |
| tree | 502b355314b1ff2e6cef52bf3778aba3bdae80cd /net | |
| parent | 25bfcd5a78a377ea4c54a3c21e44590e2fc478a6 (diff) | |
| download | linux-3.10-4d8863a29c4755a0461cd31b6865026187d6c43a.tar.gz linux-3.10-4d8863a29c4755a0461cd31b6865026187d6c43a.tar.bz2 linux-3.10-4d8863a29c4755a0461cd31b6865026187d6c43a.zip | |
pkt_sched: Don't hold qdisc lock over qdisc_destroy().
Based upon reports by Denys Fedoryshchenko, and feedback
and help from Jarek Poplawski and Herbert Xu.
We always either:
1) Never made an external reference to this qdisc.
or
2) Did a dev_deactivate() which purged all asynchronous
references.
So do not lock the qdisc when we call qdisc_destroy(),
it's illegal anyways as when we drop the lock this is
free'd memory.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_api.c | 13 | ||||
| -rw-r--r-- | net/sched/sch_generic.c | 6 |
2 files changed, 2 insertions, 17 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 7d7070b1eeb..d91a2338877 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -638,11 +638,8 @@ static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid if (new || old) qdisc_notify(skb, n, clid, old, new); - if (old) { - sch_tree_lock(old); + if (old) qdisc_destroy(old); - sch_tree_unlock(old); - } } /* Graft qdisc "new" to class "classid" of qdisc "parent" or @@ -1092,16 +1089,10 @@ create_n_graft: graft: if (1) { - spinlock_t *root_lock; - err = qdisc_graft(dev, p, skb, n, clid, q, NULL); if (err) { - if (q) { - root_lock = qdisc_root_lock(q); - spin_lock_bh(root_lock); + if (q) qdisc_destroy(q); - spin_unlock_bh(root_lock); - } return err; } } diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 6f96b7bc080..c3ed4d44fc1 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -518,8 +518,6 @@ void qdisc_reset(struct Qdisc *qdisc) } EXPORT_SYMBOL(qdisc_reset); -/* Under qdisc_lock(qdisc) and BH! */ - void qdisc_destroy(struct Qdisc *qdisc) { const struct Qdisc_ops *ops = qdisc->ops; @@ -712,14 +710,10 @@ static void shutdown_scheduler_queue(struct net_device *dev, struct Qdisc *qdisc_default = _qdisc_default; if (qdisc) { - spinlock_t *root_lock = qdisc_lock(qdisc); - dev_queue->qdisc = qdisc_default; dev_queue->qdisc_sleeping = qdisc_default; - spin_lock_bh(root_lock); qdisc_destroy(qdisc); - spin_unlock_bh(root_lock); } } |