fb_defio: Push file_update_time() into fb_deferred_io_mkwrite()

CC: Jaya Kumar <jayalk@intworks.biz>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/video/fb_defio.c

@@ -104,6 +104,8 @@ static int fb_deferred_io_mkwrite(struct vm_area_struct *vma,
 	deferred framebuffer IO. then if userspace touches a page
 	again, we repeat the same scheme */
 
+	file_update_time(vma->vm_file);
+
 	/* protect against the workqueue changing the page list */
 	mutex_lock(&fbdefio->lock);