diff --git a/mm/memory.c b/mm/memory.c
index 3944fec..7a11ddd 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1784,13 +1784,13 @@
 	if (!inode->i_op || !inode->i_op->truncate_range)
 		return -ENOSYS;
 
-	down(&inode->i_sem);
+	mutex_lock(&inode->i_mutex);
 	down_write(&inode->i_alloc_sem);
 	unmap_mapping_range(mapping, offset, (end - offset), 1);
 	truncate_inode_pages_range(mapping, offset, end);
 	inode->i_op->truncate_range(inode, offset, end);
 	up_write(&inode->i_alloc_sem);
-	up(&inode->i_sem);
+	mutex_unlock(&inode->i_mutex);
 
 	return 0;
 }