[PATCH 4.14 098/159] md/raid1/10: add missed blk plug

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Shaohua Li <shli@xxxxxx>


[ Upstream commit 18022a1bd3709b74ca31ef0b28fccd52bcd6c504 ]

flush_pending_writes isn't always called with block plug, so add it, and plug
works in nested way.

Signed-off-by: Shaohua Li <shli@xxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/md/raid1.c  |    4 ++++
 drivers/md/raid10.c |    4 ++++
 2 files changed, 8 insertions(+)

--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -810,11 +810,15 @@ static void flush_pending_writes(struct
 	spin_lock_irq(&conf->device_lock);
 
 	if (conf->pending_bio_list.head) {
+		struct blk_plug plug;
 		struct bio *bio;
+
 		bio = bio_list_get(&conf->pending_bio_list);
 		conf->pending_count = 0;
 		spin_unlock_irq(&conf->device_lock);
+		blk_start_plug(&plug);
 		flush_bio_list(conf, bio);
+		blk_finish_plug(&plug);
 	} else
 		spin_unlock_irq(&conf->device_lock);
 }
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -890,10 +890,13 @@ static void flush_pending_writes(struct
 	spin_lock_irq(&conf->device_lock);
 
 	if (conf->pending_bio_list.head) {
+		struct blk_plug plug;
 		struct bio *bio;
+
 		bio = bio_list_get(&conf->pending_bio_list);
 		conf->pending_count = 0;
 		spin_unlock_irq(&conf->device_lock);
+		blk_start_plug(&plug);
 		/* flush any pending bitmap writes to disk
 		 * before proceeding w/ I/O */
 		bitmap_unplug(conf->mddev->bitmap);
@@ -914,6 +917,7 @@ static void flush_pending_writes(struct
 				generic_make_request(bio);
 			bio = next;
 		}
+		blk_finish_plug(&plug);
 	} else
 		spin_unlock_irq(&conf->device_lock);
 }