diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
index 1c6da8d6cccf821190e0b4cf03707346356d7191..39ca31b4de4667a49bc8016d79dd95be05f970f1 100644
--- a/drivers/usb/misc/appledisplay.c
+++ b/drivers/usb/misc/appledisplay.c
@@ -148,8 +148,11 @@ static int appledisplay_bl_update_status(struct backlight_device *bd)
 		pdata->msgdata, 2,
 		ACD_USB_TIMEOUT);
 	mutex_unlock(&pdata->sysfslock);
-	
-	return retval;
+
+	if (retval < 0)
+		return retval;
+	else
+		return 0;
 }
 
 static int appledisplay_bl_get_brightness(struct backlight_device *bd)