md: use interruptible apis in idle/frozen_sync_thread

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6T6VY
CVE: NA

--------------------------------

Before refactoring idle and frozen from action_store, interruptible apis
is used so that hungtask warning won't be triggered if it takes too long
to finish indle/frozen sync_thread. This patch do the same.
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

drivers/md/md.c

@@ -4699,11 +4699,14 @@ static void idle_sync_thread(struct mddev *mddev)
 {
 	int sync_seq = atomic_read(&mddev->sync_seq);
 
-	mutex_lock(&mddev->sync_mutex);
+	if (mutex_lock_interruptible(&mddev->sync_mutex))
+		return;
+
 	clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
 	stop_sync_thread(mddev);
 
-	wait_event(resync_wait, sync_seq != atomic_read(&mddev->sync_seq) ||
+	wait_event_interruptible(resync_wait,
+			sync_seq != atomic_read(&mddev->sync_seq) ||
 			!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
 
 	mutex_unlock(&mddev->sync_mutex);
@@ -4711,11 +4714,13 @@ static void idle_sync_thread(struct mddev *mddev)
 
 static void frozen_sync_thread(struct mddev *mddev)
 {
-	mutex_lock(&mddev->sync_mutex);
+	if (mutex_lock_interruptible(&mddev->sync_mutex))
+		return;
+
 	set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
 	stop_sync_thread(mddev);
 
-	wait_event(resync_wait, mddev->sync_thread == NULL &&
+	wait_event_interruptible(resync_wait, mddev->sync_thread == NULL &&
 			!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
 
 	mutex_unlock(&mddev->sync_mutex);