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Message-ID: <20080826205829.GA2555@ami.dom.local>
Date: Tue, 26 Aug 2008 22:58:29 +0200
From: Jarek Poplawski <jarkao2@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Subject: [PATCH 3/2] pkt_sched: Fix locking of qdisc_root with
qdisc_root_sleeping_lock()
After this patch the only remaining user of qdisc_root_lock() is
ieee80211_requeue() in net/mac80211/wme.c, and probably could be
changed too.
Thanks,
Jarek P.
-------------->
pkt_sched: Fix locking of qdisc_root with qdisc_root_sleeping_lock()
Use qdisc_root_sleeping_lock() instead of qdisc_root_lock() where
appropriate. The only difference is while dev is deactivated, when
currently we can use a sleeping qdisc with the lock of noop_qdisc.
This shouldn't be dangerous since after deactivation root lock could
be used only by gen_estimator code, but looks wrong anyway.
Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
---
net/sched/cls_api.c | 2 +-
net/sched/cls_route.c | 2 +-
net/sched/sch_api.c | 8 ++++----
net/sched/sch_cbq.c | 2 +-
net/sched/sch_htb.c | 4 ++--
net/sched/sch_netem.c | 2 +-
net/sched/sch_teql.c | 2 +-
7 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 5cafdd4..8eb79e9 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -205,7 +205,7 @@ replay:
}
}
- root_lock = qdisc_root_lock(q);
+ root_lock = qdisc_root_sleeping_lock(q);
if (tp == NULL) {
/* Proto-tcf does not exist, create new one */
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index 481260a..e3d8455 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -75,7 +75,7 @@ static __inline__ int route4_fastmap_hash(u32 id, int iif)
static inline
void route4_reset_fastmap(struct Qdisc *q, struct route4_head *head, u32 id)
{
- spinlock_t *root_lock = qdisc_root_lock(q);
+ spinlock_t *root_lock = qdisc_root_sleeping_lock(q);
spin_lock_bh(root_lock);
memset(head->fastmap, 0, sizeof(head->fastmap));
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 85e078c..14c11a0 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1169,8 +1169,8 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
if (q->stab && qdisc_dump_stab(skb, q->stab) < 0)
goto nla_put_failure;
- if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
- TCA_XSTATS, qdisc_root_lock(q), &d) < 0)
+ if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
+ qdisc_root_sleeping_lock(q), &d) < 0)
goto nla_put_failure;
if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
@@ -1461,8 +1461,8 @@ static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
goto nla_put_failure;
- if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
- TCA_XSTATS, qdisc_root_lock(q), &d) < 0)
+ if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
+ qdisc_root_sleeping_lock(q), &d) < 0)
goto nla_put_failure;
if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 9b720ad..8b06fa9 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1754,7 +1754,7 @@ 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);
+ spinlock_t *root_lock = qdisc_root_sleeping_lock(sch);
struct cbq_sched_data *q = qdisc_priv(sch);
spin_lock_bh(root_lock);
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 97d4761..d14f020 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1043,7 +1043,7 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt)
static int htb_dump(struct Qdisc *sch, struct sk_buff *skb)
{
- spinlock_t *root_lock = qdisc_root_lock(sch);
+ spinlock_t *root_lock = qdisc_root_sleeping_lock(sch);
struct htb_sched *q = qdisc_priv(sch);
struct nlattr *nest;
struct tc_htb_glob gopt;
@@ -1075,7 +1075,7 @@ static int htb_dump_class(struct Qdisc *sch, unsigned long arg,
struct sk_buff *skb, struct tcmsg *tcm)
{
struct htb_class *cl = (struct htb_class *)arg;
- spinlock_t *root_lock = qdisc_root_lock(sch);
+ spinlock_t *root_lock = qdisc_root_sleeping_lock(sch);
struct nlattr *nest;
struct tc_htb_opt opt;
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index fb0294d..3781e55 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -341,7 +341,7 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
for (i = 0; i < n; i++)
d->table[i] = data[i];
- root_lock = qdisc_root_lock(sch);
+ root_lock = qdisc_root_sleeping_lock(sch);
spin_lock_bh(root_lock);
d = xchg(&q->delay_dist, d);
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index 2c35c67..d35ef05 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -161,7 +161,7 @@ teql_destroy(struct Qdisc* sch)
txq = netdev_get_tx_queue(master->dev, 0);
master->slaves = NULL;
- root_lock = qdisc_root_lock(txq->qdisc);
+ root_lock = qdisc_root_sleeping_lock(txq->qdisc);
spin_lock_bh(root_lock);
qdisc_reset(txq->qdisc);
spin_unlock_bh(root_lock);
--
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