[PATCH 5.4 158/389] mtd: sm_ftl: Fix deadlock caused by cancel_work_sync in sm_release

From: Greg Kroah-Hartman
Date: Tue Aug 23 2022 - 07:27:52 EST


From: Duoming Zhou <duoming@xxxxxxxxxx>

[ Upstream commit a61528d997619a518ee8c51cf0ef0513021afaff ]

There is a deadlock between sm_release and sm_cache_flush_work
which is a work item. The cancel_work_sync in sm_release will
not return until sm_cache_flush_work is finished. If we hold
mutex_lock and use cancel_work_sync to wait the work item to
finish, the work item also requires mutex_lock. As a result,
the sm_release will be blocked forever. The race condition is
shown below:

(Thread 1) | (Thread 2)
sm_release |
mutex_lock(&ftl->mutex) | sm_cache_flush_work
| mutex_lock(&ftl->mutex)
cancel_work_sync | ...

This patch moves del_timer_sync and cancel_work_sync out of
mutex_lock in order to mitigate deadlock.

Fixes: 7d17c02a01a1 ("mtd: Add new SmartMedia/xD FTL")
Signed-off-by: Duoming Zhou <duoming@xxxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20220524044841.10517-1-duoming@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/mtd/sm_ftl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c
index 4744bf94ad9a..d4e72fd5e5b3 100644
--- a/drivers/mtd/sm_ftl.c
+++ b/drivers/mtd/sm_ftl.c
@@ -1097,9 +1097,9 @@ static void sm_release(struct mtd_blktrans_dev *dev)
{
struct sm_ftl *ftl = dev->priv;

- mutex_lock(&ftl->mutex);
del_timer_sync(&ftl->timer);
cancel_work_sync(&ftl->flush_work);
+ mutex_lock(&ftl->mutex);
sm_cache_flush(ftl);
mutex_unlock(&ftl->mutex);
}
--
2.35.1