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authorJarek Poplawski <jarkao2@gmail.com>2008-08-27 02:25:17 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-27 02:25:17 -0700
commitf6f9b93f1624206c802ac9162c9302edaf59bfd9 (patch)
tree643bd211bf909118311138e588a78834fad7a40d /net/sched
parentf7a54c13c7b072d9426bd5cec1cdb8306df5ef55 (diff)
downloadlinux-2.6.38-lt-ux500-f6f9b93f1624206c802ac9162c9302edaf59bfd9.tar.gz
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')
-rw-r--r--net/sched/sch_api.c14
-rw-r--r--net/sched/sch_cbq.c4
-rw-r--r--net/sched/sch_hfsc.c4
-rw-r--r--net/sched/sch_htb.c4
4 files changed, 17 insertions, 9 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index ad9cda1b8c0..506b709510b 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;
}
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 8fa90d68ec6..9b720adedea 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1839,7 +1839,7 @@ 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,
- qdisc_root_lock(sch),
+ qdisc_root_sleeping_lock(sch),
tca[TCA_RATE]);
return 0;
}
@@ -1930,7 +1930,7 @@ 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,
- qdisc_root_lock(sch), tca[TCA_RATE]);
+ qdisc_root_sleeping_lock(sch), tca[TCA_RATE]);
*arg = (unsigned long)cl;
return 0;
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index c2b8d9cce3d..c1e77da8cd0 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1045,7 +1045,7 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
if (tca[TCA_RATE])
gen_replace_estimator(&cl->bstats, &cl->rate_est,
- qdisc_root_lock(sch),
+ qdisc_root_sleeping_lock(sch),
tca[TCA_RATE]);
return 0;
}
@@ -1104,7 +1104,7 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
if (tca[TCA_RATE])
gen_new_estimator(&cl->bstats, &cl->rate_est,
- qdisc_root_lock(sch), tca[TCA_RATE]);
+ qdisc_root_sleeping_lock(sch), tca[TCA_RATE]);
*arg = (unsigned long)cl;
return 0;
}
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 0df0df202ed..97d4761cc31 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1372,7 +1372,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
goto failure;
gen_new_estimator(&cl->bstats, &cl->rate_est,
- qdisc_root_lock(sch),
+ qdisc_root_sleeping_lock(sch),
tca[TCA_RATE] ? : &est.nla);
cl->refcnt = 1;
cl->children = 0;
@@ -1427,7 +1427,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
} else {
if (tca[TCA_RATE])
gen_replace_estimator(&cl->bstats, &cl->rate_est,
- qdisc_root_lock(sch),
+ qdisc_root_sleeping_lock(sch),
tca[TCA_RATE]);
sch_tree_lock(sch);
}