[PATCH 6.2 0901/1001] dm: add cond_resched() to dm_wq_work()

From: Pingfan Liu piliu@redhat.com

commit 0ca44fcef241768fd25ee763b3d203b9852f269b upstream.

Otherwise the while() loop in dm_wq_work() can result in a "dead loop" on systems that have preemption disabled. This is particularly problematic on single cpu systems.

Cc: stable@vger.kernel.org Signed-off-by: Pingfan Liu piliu@redhat.com Acked-by: Ming Lei ming.lei@redhat.com Signed-off-by: Mike Snitzer snitzer@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/dm.c | 1 + 1 file changed, 1 insertion(+)

--- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2565,6 +2565,7 @@ static void dm_wq_work(struct work_struc break;

submit_bio_noacct(bio); + cond_resched(); } }