linux-kernel - [PATCH] backlight, classmate-laptop: fix missing registration failure handling

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Date:	Fri, 26 Feb 2010 12:59:39 +0100
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>,
	Daniel Oliveira Nascimento <don@...t.com.br>
Cc:	Richard Purdie <rpurdie@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...ux-vserver.org>
---
 drivers/platform/x86/classmate-laptop.c |    2 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c
index bfae789..66f6aad 100644
--- a/drivers/platform/x86/classmate-laptop.c
+++ b/drivers/platform/x86/classmate-laptop.c
@@ -452,7 +452,7 @@ 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
 };
@@ -463,6 +463,8 @@ static int cmpc_bl_add(struct acpi_device *acpi)
 
 	bd = backlight_device_register("cmpc_bl", &acpi->dev,
 				       acpi->handle, &cmpc_bl_ops);
+	if (IS_ERR(bd))
+		return PTR_ERR(bd);
 	bd->props.max_brightness = 7;
 	dev_set_drvdata(&acpi->dev, bd);
 	return 0;
-- 
1.6.4.4

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