diff --git a/mm/mmap.c b/mm/mmap.c
index 57de816e2614..295197b75cb0 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -895,10 +895,9 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
 			anon_vma_interval_tree_post_update_vma(next);
 		anon_vma_unlock_write(anon_vma);
 	}
-	if (mapping)
-		i_mmap_unlock_write(mapping);
 
 	if (root) {
+		i_mmap_unlock_write(mapping);
 		uprobe_mmap(vma);
 
 		if (adjust_next)