[PATCH 5.10 385/529] dm: add cond_resched() to dm_wq_work()

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Pingfan Liu <piliu@xxxxxxxxxx>

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@xxxxxxxxxxxxxxx
Signed-off-by: Pingfan Liu <piliu@xxxxxxxxxx>
Acked-by: Ming Lei <ming.lei@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/md/dm.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2393,6 +2393,7 @@ static void dm_wq_work(struct work_struc
 			break;
 
 		submit_bio_noacct(bio);
+		cond_resched();
 	}
 }