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blk-cgroup: fix missing put device in error path from blkg_conf_pref()

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If blk_queue_enter() failed due to queue is dying, the
blkdev_put_no_open() is needed because blkcg_conf_open_bdev() succeeded.

Fixes: 0c9d338c84 ("blk-cgroup: synchronize blkg creation against policy deactivation")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20211102020705.2321858-1-yukuai3@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2021-11-02 10:07:05 +08:00 committed by Jens Axboe
parent 245a489e81
commit 15c3010496
1 changed files with 5 additions and 4 deletions
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9
block/blk-cgroup.c
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@ -640,7 +640,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
*/
ret = blk_queue_enter(q, 0);
if (ret)
return ret;
goto fail;
rcu_read_lock();
spin_lock_irq(&q->queue_lock);
@ -676,13 +676,13 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
new_blkg = blkg_alloc(pos, q, GFP_KERNEL);
if (unlikely(!new_blkg)) {
ret = -ENOMEM;
goto fail;
goto fail_exit_queue;
}
if (radix_tree_preload(GFP_KERNEL)) {
blkg_free(new_blkg);
ret = -ENOMEM;
goto fail;
goto fail_exit_queue;
}
rcu_read_lock();
@ -722,9 +722,10 @@ fail_preloaded:
fail_unlock:
spin_unlock_irq(&q->queue_lock);
rcu_read_unlock();
fail_exit_queue:
blk_queue_exit(q);
fail:
blkdev_put_no_open(bdev);
blk_queue_exit(q);
/*
* If queue was bypassing, we should retry. Do so after a
* short msleep(). It isn't strictly necessary but queue