From f77692d65d54665d81815349cc727baa85e8b71d Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Thu, 16 Feb 2023 12:10:05 -0500 Subject: [PATCH] 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 --- drivers/md/dm.c | 1 + 1 file changed, 1 insertion(+) 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(); } } -- 2.7.4