[PATCH v4 md-fixes 1/3] md: fix missing flush of sync_work

[Yu Kuai]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

Commit ac619781967b ("md: use separate work_struct for md_start_sync()")
use a new sync_work to replace del_work, however, stop_sync_thread() and
__md_stop_writes() was trying to wait for sync_thread to be done, hence
they should switch to use sync_work as well.

Noted that md_start_sync() from sync_work will grab 'reconfig_mutex',
hence other contex can't held the same lock to flush work, and this will
be fixed in later patches.

Fixes: ac619781967b ("md: use separate work_struct for md_start_sync()")
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Acked-by: Xiao Ni <xni@xxxxxxxxxx>
---
 drivers/md/md.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index c94373d64f2c..5640a948086b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4857,7 +4857,7 @@ static void stop_sync_thread(struct mddev *mddev)
 		return;
 	}
 
-	if (work_pending(&mddev->del_work))
+	if (work_pending(&mddev->sync_work))
 		flush_workqueue(md_misc_wq);
 
 	set_bit(MD_RECOVERY_INTR, &mddev->recovery);
@@ -6265,7 +6265,7 @@ static void md_clean(struct mddev *mddev)
 static void __md_stop_writes(struct mddev *mddev)
 {
 	set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-	if (work_pending(&mddev->del_work))
+	if (work_pending(&mddev->sync_work))
 		flush_workqueue(md_misc_wq);
 	if (mddev->sync_thread) {
 		set_bit(MD_RECOVERY_INTR, &mddev->recovery);
-- 
2.39.2