linux-kernel - [PATCH] blk-mq: only unregister sysfs when registration succeeded

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Date:   Sat, 12 Nov 2022 19:07:54 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Jens Axboe <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Liu Shixin <liushixin2@...wei.com>
Subject: [PATCH] blk-mq: only unregister sysfs when registration succeeded

kobject_del() must not be called if kobject_add() has not been called.
Hence only unregister sysfs when registration succeeded.

Signed-off-by: Liu Shixin <liushixin2@...wei.com>
---
 block/blk-mq-sysfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 93997d297d42..63f2df2500d9 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -279,6 +279,8 @@ void blk_mq_sysfs_unregister(struct gendisk *disk)
 	unsigned long i;
 
 	lockdep_assert_held(&q->sysfs_dir_lock);
+	if (!q->mq_sysfs_init_done)
+		return;
 
 	queue_for_each_hw_ctx(q, hctx, i)
 		blk_mq_unregister_hctx(hctx);
-- 
2.25.1