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| author | David S. Miller <davem@davemloft.net> | 2008-07-16 01:42:40 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-07-17 19:21:19 -0700 |
| commit | 7698b4fcabcd790efc4f226bada1e7b5870653af (patch) | |
| tree | 031ce7a911fc5bff995421a5615d9ab25416a479 /net/sched/sch_cbq.c | |
| parent | e2627c8c2241bce45e368e150654d076b58a4595 (diff) | |
| download | lwn-7698b4fcabcd790efc4f226bada1e7b5870653af.tar.gz lwn-7698b4fcabcd790efc4f226bada1e7b5870653af.zip | |
pkt_sched: Add and use qdisc_root() and qdisc_root_lock().
When code wants to lock the qdisc tree state, the logic
operation it's doing is locking the top-level qdisc that
sits of the root of the netdev_queue.
Add qdisc_root_lock() to represent this and convert the
easiest cases.
In order for this to work out in all cases, we have to
hook up the noop_qdisc to a dummy netdev_queue.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_cbq.c')
| -rw-r--r-- | net/sched/sch_cbq.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c index 4efc836cbf38..37ae653db683 100644 --- a/net/sched/sch_cbq.c +++ b/net/sched/sch_cbq.c @@ -1744,12 +1744,13 @@ static void cbq_put(struct Qdisc *sch, unsigned long arg) if (--cl->refcnt == 0) { #ifdef CONFIG_NET_CLS_ACT + spinlock_t *root_lock = qdisc_root_lock(sch); struct cbq_sched_data *q = qdisc_priv(sch); - spin_lock_bh(&sch->dev_queue->lock); + spin_lock_bh(root_lock); if (q->rx_class == cl) q->rx_class = NULL; - spin_unlock_bh(&sch->dev_queue->lock); + spin_unlock_bh(root_lock); #endif cbq_destroy_class(sch, cl); @@ -1828,7 +1829,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t if (tca[TCA_RATE]) gen_replace_estimator(&cl->bstats, &cl->rate_est, - &sch->dev_queue->lock, + qdisc_root_lock(sch), tca[TCA_RATE]); return 0; } @@ -1919,7 +1920,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t if (tca[TCA_RATE]) gen_new_estimator(&cl->bstats, &cl->rate_est, - &sch->dev_queue->lock, tca[TCA_RATE]); + qdisc_root_lock(sch), tca[TCA_RATE]); *arg = (unsigned long)cl; return 0; |