[PATCH 6.1 795/885] dm: add cond_resched() to dm_wq_requeue_work()

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Mike Snitzer <snitzer@xxxxxxxxxx>

commit f77692d65d54665d81815349cc727baa85e8b71d upstream.

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

Fixes: 8b211aaccb915 ("dm: add two stage requeue mechanism")
Cc: stable@xxxxxxxxxxxxxxx
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
@@ -1020,6 +1020,7 @@ static void dm_wq_requeue_work(struct wo
 		io->next = NULL;
 		__dm_io_complete(io, false);
 		io = next;
+		cond_resched();
 	}
 }