diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 69fc76c..c2cb7b8 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -68,7 +68,7 @@
 
 	/* allocate a r10bio with room for raid_disks entries in the bios array */
 	r10_bio = kzalloc(size, gfp_flags);
-	if (!r10_bio)
+	if (!r10_bio && conf->mddev)
 		unplug_slaves(conf->mddev);
 
 	return r10_bio;
@@ -2096,7 +2096,6 @@
 	if (!conf->tmppage)
 		goto out_free_conf;
 
-	conf->mddev = mddev;
 	conf->raid_disks = mddev->raid_disks;
 	conf->near_copies = nc;
 	conf->far_copies = fc;
@@ -2133,6 +2132,7 @@
 		goto out_free_conf;
 	}
 
+	conf->mddev = mddev;
 	spin_lock_init(&conf->device_lock);
 	mddev->queue->queue_lock = &conf->device_lock;