[PATCH] memstick: ms_block: destroy io_queue workqueue on removal

[Guangshuo Li <lgs201920130244@gmail.com>]

msb_init_disk() allocates msb->io_queue with alloc_ordered_workqueue(),
while msb_remove() does not destroy the workqueue.

The probe failure path releases the workqueue with destroy_workqueue(),
but the normal removal path only flushes it through msb_stop(). Flushing
a workqueue does not release the workqueue itself, so each card
insert/remove cycle leaks the workqueue and its worker.

Destroy io_queue during removal after the outstanding work has been
drained.

Fixes: 0ab30494bc4f ("memstick: add support for legacy memorysticks")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/memstick/core/ms_block.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
index ce33907bfc24..65154e569a9e 100644
--- a/drivers/memstick/core/ms_block.c
+++ b/drivers/memstick/core/ms_block.c
@@ -2204,6 +2204,8 @@ static void msb_remove(struct memstick_dev *card)
 	msb_data_clear(msb);
 	mutex_unlock(&msb_disk_lock);
 
+	destroy_workqueue(msb->io_queue);
+
 	put_disk(msb->disk);
 	memstick_set_drvdata(card, NULL);
 }
-- 
2.43.0