diff options
| author | Jarek Poplawski <jarkao2@gmail.com> | 2008-08-27 02:25:17 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-08-27 02:25:17 -0700 |
| commit | f6f9b93f1624206c802ac9162c9302edaf59bfd9 (patch) | |
| tree | 643bd211bf909118311138e588a78834fad7a40d /net/sched/sch_api.c | |
| parent | f7a54c13c7b072d9426bd5cec1cdb8306df5ef55 (diff) | |
| download | lwn-f6f9b93f1624206c802ac9162c9302edaf59bfd9.tar.gz lwn-f6f9b93f1624206c802ac9162c9302edaf59bfd9.zip | |
pkt_sched: Fix gen_estimator locks
While passing a qdisc root lock to gen_new_estimator() and
gen_replace_estimator() dev could be deactivated or even before
grafting proper root qdisc as qdisc_sleeping (e.g. qdisc_create), so
using qdisc_root_lock() is not enough. This patch adds
qdisc_root_sleeping_lock() for this, plus additional checks, where
necessary.
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_api.c')
| -rw-r--r-- | net/sched/sch_api.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index ad9cda1b8c0a..506b709510b6 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -830,9 +830,16 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, sch->stab = stab; } if (tca[TCA_RATE]) { + spinlock_t *root_lock; + + if ((sch->parent != TC_H_ROOT) && + !(sch->flags & TCQ_F_INGRESS)) + root_lock = qdisc_root_sleeping_lock(sch); + else + root_lock = qdisc_lock(sch); + err = gen_new_estimator(&sch->bstats, &sch->rate_est, - qdisc_root_lock(sch), - tca[TCA_RATE]); + root_lock, tca[TCA_RATE]); if (err) { /* * Any broken qdiscs that would require @@ -884,7 +891,8 @@ static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) if (tca[TCA_RATE]) gen_replace_estimator(&sch->bstats, &sch->rate_est, - qdisc_root_lock(sch), tca[TCA_RATE]); + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); return 0; } |