diff --git a/fs/namespace.c b/fs/namespace.c
index 461090a..4de493e 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1354,12 +1354,12 @@
 	if (err)
 		goto out_cleanup_ids;
 
+	spin_lock(&vfsmount_lock);
+
 	if (IS_MNT_SHARED(dest_mnt)) {
 		for (p = source_mnt; p; p = next_mnt(p, source_mnt))
 			set_mnt_shared(p);
 	}
-
-	spin_lock(&vfsmount_lock);
 	if (parent_path) {
 		detach_mnt(source_mnt, parent_path);
 		attach_mnt(source_mnt, path);