pkt_sched: Fix lockdep warning on est_tree_lock in gen_estimator
This patch fixes a lockdep warning:
[ 516.287584] =========================================================
[ 516.288386] [ INFO: possible irq lock inversion dependency detected ]
[ 516.288386] 2.6.35b #7
[ 516.288386] ---------------------------------------------------------
[ 516.288386] swapper/0 just changed the state of lock:
[ 516.288386] (&qdisc_tx_lock){+.-...}, at: [<c12eacda>] est_timer+0x62/0x1b4
[ 516.288386] but this lock took another, SOFTIRQ-unsafe lock in the past:
[ 516.288386] (est_tree_lock){+.+...}
[ 516.288386]
[ 516.288386] and interrupts could create inverse lock ordering between them.
...
So, est_tree_lock needs BH protection because it's taken by
qdisc_tx_lock, which is used both in BH and process contexts.
(Full warning with this patch at netdev, 02 Sep 2010.)
Fixes commit: ae638c47dc
("pkt_sched: gen_estimator: add a new lock")
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
7bcbf81a22
Коммит
0b5d404e34
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@ -232,7 +232,7 @@ int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
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est->last_packets = bstats->packets;
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est->avpps = rate_est->pps<<10;
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spin_lock(&est_tree_lock);
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spin_lock_bh(&est_tree_lock);
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if (!elist[idx].timer.function) {
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INIT_LIST_HEAD(&elist[idx].list);
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setup_timer(&elist[idx].timer, est_timer, idx);
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@ -243,7 +243,7 @@ int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
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list_add_rcu(&est->list, &elist[idx].list);
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gen_add_node(est);
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spin_unlock(&est_tree_lock);
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spin_unlock_bh(&est_tree_lock);
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return 0;
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}
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@ -270,7 +270,7 @@ void gen_kill_estimator(struct gnet_stats_basic_packed *bstats,
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{
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struct gen_estimator *e;
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spin_lock(&est_tree_lock);
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spin_lock_bh(&est_tree_lock);
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while ((e = gen_find_node(bstats, rate_est))) {
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rb_erase(&e->node, &est_root);
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@ -281,7 +281,7 @@ void gen_kill_estimator(struct gnet_stats_basic_packed *bstats,
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list_del_rcu(&e->list);
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call_rcu(&e->e_rcu, __gen_kill_estimator);
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}
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spin_unlock(&est_tree_lock);
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spin_unlock_bh(&est_tree_lock);
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}
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EXPORT_SYMBOL(gen_kill_estimator);
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@ -320,9 +320,9 @@ bool gen_estimator_active(const struct gnet_stats_basic_packed *bstats,
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ASSERT_RTNL();
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spin_lock(&est_tree_lock);
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spin_lock_bh(&est_tree_lock);
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res = gen_find_node(bstats, rate_est) != NULL;
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spin_unlock(&est_tree_lock);
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spin_unlock_bh(&est_tree_lock);
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return res;
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}
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