From: Mike Snitzer <snitzer@kernel.org>
Date: Thu, 16 Feb 2023 17:10:05 +0000 (-0500)
Subject: dm: add cond_resched() to dm_wq_requeue_work()
X-Git-Tag: v6.6.17~5251^2~9
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f77692d65d54665d81815349cc727baa85e8b71d;p=platform%2Fkernel%2Flinux-rpi.git

dm: add cond_resched() to dm_wq_requeue_work()

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@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 15b9195..adb002b 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1009,6 +1009,7 @@ static void dm_wq_requeue_work(struct work_struct *work)
 		io->next = NULL;
 		__dm_io_complete(io, false);
 		io = next;
+		cond_resched();
 	}
 }