USB: backlight, appledisplay: fix incomplete registration failure handling

On error while registering backlight, return it to caller instead of
returning 0.
Mark struct backlight_ops as const.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
index 516079d703b4..4d2952f1fb13 100644
--- a/drivers/usb/misc/appledisplay.c
+++ b/drivers/usb/misc/appledisplay.c
@@ -179,7 +179,7 @@ static int appledisplay_bl_get_brightness(struct backlight_device *bd)
                 return pdata->msgdata[1];
 }
 
-static struct backlight_ops appledisplay_bl_data = {
+static const struct backlight_ops appledisplay_bl_data = {
         .get_brightness = appledisplay_bl_get_brightness,
         .update_status  = appledisplay_bl_update_status,
 };
@@ -283,6 +283,7 @@ static int appledisplay_probe(struct usb_interface *iface,
                                                 &appledisplay_bl_data);
         if (IS_ERR(pdata->bd)) {
                 dev_err(&iface->dev, "Backlight registration failed\n");
+                retval = PTR_ERR(pdata->bd);
                 goto error;
         }