backlight: panasonic-laptop - Fix incomplete registration failure handling

Properly return backlight registration error to parent.
Mark struct backlight_ops as const.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Acked-by: Harald Welte <laforge@gnumonks.org> (registration failure)
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index ab5c9cea1462..726f02affcb6 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -352,7 +352,7 @@ static int bl_set_status(struct backlight_device *bd)
         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
 }
 
-static struct backlight_ops pcc_backlight_ops = {
+static const struct backlight_ops pcc_backlight_ops = {
         .get_brightness = bl_get,
         .update_status  = bl_set_status,
 };
@@ -651,8 +651,10 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
         props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
                                                    &pcc_backlight_ops, &props);
-        if (IS_ERR(pcc->backlight))
+        if (IS_ERR(pcc->backlight)) {
+                result = PTR_ERR(pcc->backlight);
                 goto out_sinf;
+        }
 
         /* read the initial brightness setting from the hardware */
         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];