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ACPI video: correct error-handling code

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backlight_device_register may return an ERR_PTR
value rather than a valid pointer.

Problem found by Julia Lawall, properly fixed by Zhang Rui.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhang Rui 2009-07-29 08:53:29 +08:00 committed by Len Brown
parent 6b7b284958
commit e01ce79b7f
1 changed files with 3 additions and 1 deletions
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4
drivers/acpi/video.c
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@ -999,8 +999,10 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
sprintf(name, "acpi_video%d", count++);
device->backlight = backlight_device_register(name,
NULL, device, &acpi_backlight_ops);
device->backlight->props.max_brightness = device->brightness->count-3;
kfree(name);
if (IS_ERR(device->backlight))
return;
device->backlight->props.max_brightness = device->brightness->count-3;
result = sysfs_create_link(&device->backlight->dev.kobj,
&device->dev->dev.kobj, "device");