backlight: classmate-laptop - Fix missing registration failure handling

Check newly registered backlight_device for error and properly
return error to parent.
Mark struct backlight_ops as const.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c
index 6670ed8f9e5..c696cf1c261 100644
--- a/drivers/platform/x86/classmate-laptop.c
+++ b/drivers/platform/x86/classmate-laptop.c
@@ -455,7 +455,7 @@ static int cmpc_bl_update_status(struct backlight_device *bd)
                 return -1;
 }
 
-static struct backlight_ops cmpc_bl_ops = {
+static const struct backlight_ops cmpc_bl_ops = {
         .get_brightness = cmpc_bl_get_brightness,
         .update_status = cmpc_bl_update_status
 };
@@ -469,6 +469,8 @@ static int cmpc_bl_add(struct acpi_device *acpi)
         props.max_brightness = 7;
         bd = backlight_device_register("cmpc_bl", &acpi->dev, acpi->handle,
                                        &cmpc_bl_ops, &props);
+        if (IS_ERR(bd))
+                return PTR_ERR(bd);
         dev_set_drvdata(&acpi->dev, bd);
         return 0;
 }