raid5-cache: suspend reclaim thread instead of shutdown
There is mechanism to suspend a kernel thread. Use it instead of playing
create/destroy game.
Signed-off-by: Shaohua Li <shli@fb.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Cc: Song Liu <songliubraving@fb.com>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 62f3fb9..297757a 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7187,10 +7187,12 @@ static int md_thread(void *arg)
wait_event_interruptible_timeout
(thread->wqueue,
test_bit(THREAD_WAKEUP, &thread->flags)
- || kthread_should_stop(),
+ || kthread_should_stop() || kthread_should_park(),
thread->timeout);
clear_bit(THREAD_WAKEUP, &thread->flags);
+ if (kthread_should_park())
+ kthread_parkme();
if (!kthread_should_stop())
thread->run(thread);
}