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From: Yu Kuai <yukuai3@huawei.com>
To: <tj@kernel.org>, <axboe@kernel.dk>, <yukuai3@huawei.com>
Cc: <cgroups@vger.kernel.org>, <linux-block@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <yi.zhang@huawei.com>
Subject: [PATCH] blk-cgroup: fix missing put device in error path from blkg_conf_pref()
Date: Tue, 2 Nov 2021 10:07:05 +0800	[thread overview]
Message-ID: <20211102020705.2321858-1-yukuai3@huawei.com> (raw)

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>
---
 block/blk-cgroup.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 88b1fce90520..663aabfeba18 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -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 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
 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
-- 
2.31.1


WARNING: multiple messages have this Message-ID (diff)
From: Yu Kuai <yukuai3@huawei.com>
To: tj@kernel.org, axboe@kernel.dk, yukuai3@huawei.com
Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org, yi.zhang@huawei.com
Subject: [PATCH] blk-cgroup: fix missing put device in error path from blkg_conf_pref()
Date: Tue, 2 Nov 2021 10:07:05 +0800	[thread overview]
Message-ID: <20211102020705.2321858-1-yukuai3@huawei.com> (raw)

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>
---
 block/blk-cgroup.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 88b1fce90520..663aabfeba18 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -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 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
 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
-- 
2.31.1


             reply	other threads:[~2021-11-02  1:54 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-02  2:07 Yu Kuai [this message]
2021-11-02  2:07 ` [PATCH] blk-cgroup: fix missing put device in error path from blkg_conf_pref() Yu Kuai
2021-11-06  9:12 ` yukuai (C)
2021-11-06  9:12   ` yukuai (C)
2021-11-15 21:37 ` Tejun Heo
2021-11-15 21:37   ` Tejun Heo
2021-11-19  8:09 ` yukuai (C)
2021-11-19  8:09   ` yukuai (C)
2021-11-19 13:27 ` Jens Axboe
2021-11-19 13:27   ` Jens Axboe

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