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cgroup: fix rcu_read_lock() leak in update_if_frozen()

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While updating cgroup_freezer locking, 68fafb77d827 ("cgroup_freezer:
replace freezer->lock with freezer_mutex") introduced a bug in
update_if_frozen() where it returns with rcu_read_lock() held.  Fix it
by adding rcu_read_unlock() before returning.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
This commit is contained in:
Tejun Heo
2014-05-13 11:28:30 -04:00
parent e5ced8ebb1
commit 36e9d2ebcc
1 changed files with 3 additions and 1 deletions
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kernel/cgroup_freezer.c
+3 -1
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@@ -267,8 +267,10 @@ static void update_if_frozen(struct cgroup_subsys_state *css)
struct freezer *child = css_freezer(pos);
if ((child->state & CGROUP_FREEZER_ONLINE) &&
!(child->state & CGROUP_FROZEN))
!(child->state & CGROUP_FROZEN)) {
rcu_read_unlock();
return;
}
}
rcu_read_unlock();