From: Duoming Zhou duoming@zju.edu.cn
[ 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@zju.edu.cn Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20220524044841.10517-1-duoming@zju.edu.cn Signed-off-by: Sasha Levin sashal@kernel.org --- 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); }