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blkcg: fix blkcg->css ref leak in __blkg_lookup_create()

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__blkg_lookup_create() leaked blkcg->css ref if blkg allocation
failed.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2012-04-19 16:29:23 -07:00 committed by Jens Axboe
parent aaf7c68068
commit 496fb7806d
1 changed files with 9 additions and 10 deletions
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19
block/blk-cgroup.c
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@ -174,6 +174,7 @@ static struct blkcg_gq *__blkg_lookup_create(struct blkcg *blkcg,
__releases(q->queue_lock) __acquires(q->queue_lock)
{
struct blkcg_gq *blkg;
int ret;
WARN_ON_ONCE(!rcu_read_lock_held());
lockdep_assert_held(q->queue_lock);
@ -186,24 +187,22 @@ static struct blkcg_gq *__blkg_lookup_create(struct blkcg *blkcg,
if (!css_tryget(&blkcg->css))
return ERR_PTR(-EINVAL);
/*
* Allocate and initialize.
*/
/* allocate */
ret = -ENOMEM;
blkg = blkg_alloc(blkcg, q);
/* did alloc fail? */
if (unlikely(!blkg)) {
blkg = ERR_PTR(-ENOMEM);
goto out;
}
if (unlikely(!blkg))
goto err_put;
/* insert */
spin_lock(&blkcg->lock);
hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list);
list_add(&blkg->q_node, &q->blkg_list);
spin_unlock(&blkcg->lock);
out:
return blkg;
err_put:
css_put(&blkcg->css);
return ERR_PTR(ret);
}
struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,