null_blk: Fix missing mutex_destroy() at module removal

[ Upstream commit 07d1b99825f40f9c0d93e6b99d79a08d0717bac1 ]

When a mutex lock is not used any more, the function mutex_destroy
should be called to mark the mutex lock uninitialized.

Fixes: f2298c0403b0 ("null_blk: multi queue aware block test driver")
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Link: https://lore.kernel.org/r/20240425171635.4227-1-yanjun.zhu@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 36755f263e8ec03b1828bf44a05cc3b54bb6a03f..3584f389b92ce92a5e90c4291f94bab8ffc5a953 100644 (file)
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -2372,6 +2372,8 @@ static void __exit null_exit(void)
 
        if (g_queue_mode == NULL_Q_MQ && shared_tags)
                blk_mq_free_tag_set(&tag_set);
+
+       mutex_destroy(&lock);
 }
 
 module_init(null_init);