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ACPI: don't free non-existent backlight in acpi video module

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acpi_video_put_one_device was attempting to remove sysfs entries and
unregister a backlight device without first checking that said backlight
device structure had been created.

Signed-off-by: Keith Packard <[email protected]>
Acked-by: Zhang Rui <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Keith Packard 2009-08-06 15:57:54 -07:00 • committed by Len Brown
commit e29b3ee3b0
1 changed files with 5 additions and 2 deletions
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7
drivers/acpi/video.c
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@ -2004,8 +2004,11 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
status = acpi_remove_notify_handler(device->dev->handle,
ACPI_DEVICE_NOTIFY,
acpi_video_device_notify);
sysfs_remove_link(&device->backlight->dev.kobj, "device");
backlight_device_unregister(device->backlight);
if (device->backlight) {
sysfs_remove_link(&device->backlight->dev.kobj, "device");
backlight_device_unregister(device->backlight);
device->backlight = NULL;
}
if (device->cdev) {
sysfs_remove_link(&device->dev->dev.kobj,
"thermal_cooling");