diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2613227..9785209 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3359,9 +3359,9 @@
 	disk->queue = mddev->queue;
 	add_disk(disk);
 	mddev->gendisk = disk;
-	mutex_unlock(&disks_mutex);
 	error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
 				     "%s", "md");
+	mutex_unlock(&disks_mutex);
 	if (error)
 		printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
 		       disk->disk_name);