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dm-delay: fix hung task introduced by kthread mode

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If the worker thread is not woken due to a bio, then it is not woken at
all. This causes the hung task check to trigger. This occurs, for
instance, when no bios are submitted. Also when a delay of 0 is
configured, delay_bio() returns without waking the worker.

Prevent the hung task check from triggering by creating the thread with
kthread_run() instead of using kthread_create() directly.

Fixes: 70bbeb29fab0 ("dm delay: for short delays, use kthread instead of timers and wq")
Signed-off-by: Joel Colledge <joel.colledge@linbit.com>
Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Joel Colledge 2024-05-06 09:25:23 +02:00 committed by Mike Snitzer
parent 8d24790ed0
commit d14646f233
1 changed files with 1 additions and 2 deletions
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3
drivers/md/dm-delay.c
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@ -269,8 +269,7 @@ out:
* In case of small requested delays, use kthread instead of
* timers and workqueue to achieve better latency.
*/
dc->worker = kthread_create(&flush_worker_fn, dc,
"dm-delay-flush-worker");
dc->worker = kthread_run(&flush_worker_fn, dc, "dm-delay-flush-worker");
if (IS_ERR(dc->worker)) {
ret = PTR_ERR(dc->worker);
dc->worker = NULL;