[PATCH 21/37] bcache: destroy dc->writeback_write_wq if failed to create dc->writeback_thread

[Coly Li]

Commit 9baf30972b55 ("bcache: fix for gc and write-back race") added a
new work queue dc->writeback_write_wq, but forgot to destroy it in the
error condition when creating dc->writeback_thread failed.

This patch destroys dc->writeback_write_wq if kthread_create() returns
error pointer to dc->writeback_thread, then a memory leak is avoided.

Fixes: 9baf30972b55 ("bcache: fix for gc and write-back race")
Signed-off-by: Coly Li <col...@suse.de>
Cc: sta...@vger.kernel.org
---
 drivers/md/bcache/writeback.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 262f7ef20992..21081febcb59 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -833,6 +833,7 @@ int bch_cached_dev_writeback_start(struct cached_dev *dc)
                                              "bcache_writeback");
        if (IS_ERR(dc->writeback_thread)) {
                cached_dev_put(dc);
+               destroy_workqueue(dc->writeback_write_wq);
                return PTR_ERR(dc->writeback_thread);
        }
        dc->writeback_running = true;
-- 
2.16.4