md: remove parameter check_seq for stop_sync_thread()

Caller will always set MD_RECOVERY_FROZEN if check_seq is true, and
always clear MD_RECOVERY_FROZEN if check_seq is false, hence replace
the parameter with test_bit() to make code cleaner.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240611132251.1967786-7-yukuai1@huaweicloud.com

Author: YuKuai-huawei

drivers/md/md.c

@@ -4961,15 +4961,10 @@ action_show(struct mddev *mddev, char *page)
  * @locked:	if set, reconfig_mutex will still be held after this function
  *		return; if not set, reconfig_mutex will be released after this
  *		function return.
- * @check_seq:	if set, only wait for curent running sync_thread to stop, noted
- *		that new sync_thread can still start.
  */
-static void stop_sync_thread(struct mddev *mddev, bool locked, bool check_seq)
+static void stop_sync_thread(struct mddev *mddev, bool locked)
 {
-	int sync_seq;
-
-	if (check_seq)
-		sync_seq = atomic_read(&mddev->sync_seq);
+	int sync_seq = atomic_read(&mddev->sync_seq);
 
 	if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
 		if (!locked)
@@ -4990,7 +4985,8 @@ static void stop_sync_thread(struct mddev *mddev, bool locked, bool check_seq)
 
 	wait_event(resync_wait,
 		   !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
-		   (check_seq && sync_seq != atomic_read(&mddev->sync_seq)));
+		   (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery) &&
+		    sync_seq != atomic_read(&mddev->sync_seq)));
 
 	if (locked)
 		mddev_lock_nointr(mddev);
@@ -5001,7 +4997,7 @@ void md_idle_sync_thread(struct mddev *mddev)
 	lockdep_assert_held(&mddev->reconfig_mutex);
 
 	clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-	stop_sync_thread(mddev, true, true);
+	stop_sync_thread(mddev, true);
 }
 EXPORT_SYMBOL_GPL(md_idle_sync_thread);
 
@@ -5010,7 +5006,7 @@ void md_frozen_sync_thread(struct mddev *mddev)
 	lockdep_assert_held(&mddev->reconfig_mutex);
 
 	set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-	stop_sync_thread(mddev, true, false);
+	stop_sync_thread(mddev, true);
 }
 EXPORT_SYMBOL_GPL(md_frozen_sync_thread);
 
@@ -5035,7 +5031,7 @@ static void idle_sync_thread(struct mddev *mddev)
 		return;
 	}
 
-	stop_sync_thread(mddev, false, true);
+	stop_sync_thread(mddev, false);
 	mutex_unlock(&mddev->sync_mutex);
 }
 
@@ -5049,7 +5045,7 @@ static void frozen_sync_thread(struct mddev *mddev)
 		return;
 	}
 
-	stop_sync_thread(mddev, false, false);
+	stop_sync_thread(mddev, false);
 	mutex_unlock(&mddev->sync_mutex);
 }
 
@@ -6544,7 +6540,7 @@ void md_stop_writes(struct mddev *mddev)
 {
 	mddev_lock_nointr(mddev);
 	set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-	stop_sync_thread(mddev, true, false);
+	stop_sync_thread(mddev, true);
 	__md_stop_writes(mddev);
 	mddev_unlock(mddev);
 }
@@ -6612,7 +6608,7 @@ static int md_set_readonly(struct mddev *mddev)
 		set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
 	}
 
-	stop_sync_thread(mddev, false, false);
+	stop_sync_thread(mddev, false);
 	wait_event(mddev->sb_wait,
 		   !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
 	mddev_lock_nointr(mddev);
@@ -6658,7 +6654,7 @@ static int do_md_stop(struct mddev *mddev, int mode)
 		set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
 	}
 
-	stop_sync_thread(mddev, true, false);
+	stop_sync_thread(mddev, true);
 
 	if (mddev->sysfs_active ||
 	    test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {