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| author | Yu Kuai <yukuai3@huawei.com> | 2021-11-02 05:07:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-25 11:48:41 +0300 |
| commit | 6ffad92d05b0702f349f0df7e52183a3c4a91b8d (patch) | |
| tree | d68feb2286dc25a556387b27681083dd468a1a3c /block | |
| parent | 4220cc6e113caa126ddca8eeb796c213cb492e0e (diff) | |
| download | linux-6ffad92d05b0702f349f0df7e52183a3c4a91b8d.tar.xz | |
blk-cgroup: fix missing put device in error path from blkg_conf_pref()
[ Upstream commit 15c30104965101b8e76b24d27035569d6613a7d6 ]
If blk_queue_enter() failed due to queue is dying, the
blkdev_put_no_open() is needed because blkcg_conf_open_bdev() succeeded.
Fixes: 0c9d338c8443 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-cgroup.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index ebff1af402e5..0eec59e4df65 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -639,7 +639,7 @@ 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); @@ -675,13 +675,13 @@ 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(); @@ -721,9 +721,10 @@ 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 |