diff --git a/[refs] b/[refs]
index 2fa04160c1d4..d0ea7dbed103 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 43c73ca43b3e03bb228ff9350b6b44d0e560f262
+refs/heads/master: defad61a5b16352d3e22a04d4c930a5b5a7fd1f0
diff --git a/trunk/drivers/md/md.c b/trunk/drivers/md/md.c
index 540347c538f9..f43ff2962b2b 100644
--- a/trunk/drivers/md/md.c
+++ b/trunk/drivers/md/md.c
@@ -4704,7 +4704,7 @@ static void md_clean(mddev_t *mddev)
 	mddev->plug = NULL;
 }
 
-void md_stop_writes(mddev_t *mddev)
+static void __md_stop_writes(mddev_t *mddev)
 {
 	if (mddev->sync_thread) {
 		set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
@@ -4724,6 +4724,13 @@ void md_stop_writes(mddev_t *mddev)
 		md_update_sb(mddev, 1);
 	}
 }
+
+void md_stop_writes(mddev_t *mddev)
+{
+	mddev_lock(mddev);
+	__md_stop_writes(mddev);
+	mddev_unlock(mddev);
+}
 EXPORT_SYMBOL_GPL(md_stop_writes);
 
 void md_stop(mddev_t *mddev)
@@ -4748,7 +4755,7 @@ static int md_set_readonly(mddev_t *mddev, int is_open)
 		goto out;
 	}
 	if (mddev->pers) {
-		md_stop_writes(mddev);
+		__md_stop_writes(mddev);
 
 		err  = -ENXIO;
 		if (mddev->ro==1)
@@ -4785,7 +4792,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
 		if (mddev->ro)
 			set_disk_ro(disk, 0);
 
-		md_stop_writes(mddev);
+		__md_stop_writes(mddev);
 		md_stop(mddev);
 		mddev->queue->merge_bvec_fn = NULL;
 		mddev->queue->unplug_fn = NULL;