[PATCH] backlight, msi-laptop, msi-wmi: fix incomplete registration failure handling

["Bruno Prémont" <bonbons@linux-vserver.org>]

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

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Reviewed-by: Anisse Astier <anisse@astier.eu>
---
 drivers/platform/x86/msi-laptop.c    |    2 +-
 drivers/platform/x86/msi-wmi.c       |    6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/msi-laptop.c b/drivers/platform/x86/msi-laptop.c
index 759763d..1093ba2 100644
--- a/drivers/platform/x86/msi-laptop.c
+++ b/drivers/platform/x86/msi-laptop.c
@@ -161,7 +161,7 @@ static int bl_update_status(struct backlight_device *b)
 	return set_lcd_level(b->props.brightness);
 }
 
-static struct backlight_ops msibl_ops = {
+static const struct backlight_ops msibl_ops = {
 	.get_brightness = bl_get_brightness,
 	.update_status  = bl_update_status,
 };
diff --git a/drivers/platform/x86/msi-wmi.c b/drivers/platform/x86/msi-wmi.c
index f5f70d4..5f7cff1 100644
--- a/drivers/platform/x86/msi-wmi.c
+++ b/drivers/platform/x86/msi-wmi.c
@@ -138,7 +138,7 @@ static int bl_set_status(struct backlight_device *bd)
 	return msi_wmi_set_block(0, backlight_map[bright]);
 }
 
-static struct backlight_ops msi_backlight_ops = {
+static const struct backlight_ops msi_backlight_ops = {
 	.get_brightness	= bl_get,
 	.update_status	= bl_set_status,
 };
@@ -251,8 +251,10 @@ static int __init msi_wmi_init(void)
 	if (!acpi_video_backlight_support()) {
 		backlight = backlight_device_register(DRV_NAME,
 				NULL, NULL, &msi_backlight_ops);
-		if (IS_ERR(backlight))
+		if (IS_ERR(backlight)) {
+			err = PTR_ERR(backlight);
 			goto err_free_input;
+		}
 
 		backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
 		err = bl_get(NULL);
-- 
1.6.4.4