On Mon, Apr 22, 2013 at 08:39:15PM +0800, Chun-Yi Lee wrote:
> From: "Lee, Chun-Yi" <j...@suse.com>
> +static acpi_status
> +find_video_unregister_backlight(acpi_handle handle, u32 lvl, void *context,
> + void **rv)
> +{
> + struct acpi_device *acpi_dev;
> + struct acpi_video_bus *video = NULL;
Gratuitous initialization of local variables prevents compiler from
warning when you using variable uninitialized.
> + struct acpi_video_device *dev, *next;
> +
> + if (acpi_bus_get_device(handle, &acpi_dev))
> + return AE_OK;
> +
> + if (!acpi_match_device_ids(acpi_dev, video_device_ids)) {
> + video = acpi_driver_data(acpi_dev);
> + acpi_video_bus_stop_devices(video);
> + mutex_lock(&video->device_list_lock);
> + list_for_each_entry_safe(dev, next, &video->video_device_list,
> + entry) {
> + if (dev->backlight) {
> + backlight_device_unregister(dev->backlight);
> + dev->backlight = NULL;
> + kfree(dev->brightness->levels);
> + kfree(dev->brightness);
> + }
> + }
> + mutex_unlock(&video->device_list_lock);
> + acpi_video_bus_start_devices(video);
> + }
> + return AE_OK;
> +}
> +
> +void acpi_video_backlight_unregister(void)
> +{
> + if (!register_count) {
Locking? It looks like the rest of the driver ignores locking too...
> + /*
> + * If the acpi video bus is already unloaded, don't
> + * unregister backlight of devices and return directly.
> + */
> + return;
> + }
> + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> + ACPI_UINT32_MAX, find_video_unregister_backlight,
> + NULL, NULL, NULL);
> + return;
> +}
> +EXPORT_SYMBOL(acpi_video_backlight_unregister);
> +
> int acpi_video_register(void)
> {
> int result = 0;
> diff --git a/include/acpi/video.h b/include/acpi/video.h
> index 61109f2..1e810a1 100644
> --- a/include/acpi/video.h
> +++ b/include/acpi/video.h
> @@ -19,11 +19,13 @@ struct acpi_device;
> #if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
> extern int acpi_video_register(void);
> extern void acpi_video_unregister(void);
> +extern void acpi_video_backlight_unregister(void);
> extern int acpi_video_get_edid(struct acpi_device *device, int type,
> int device_id, void **edid);
> #else
> static inline int acpi_video_register(void) { return 0; }
> static inline void acpi_video_unregister(void) { return; }
> +static inline void acpi_video_backlight_unregister(void) { return; }
> static inline int acpi_video_get_edid(struct acpi_device *device, int type,
> int device_id, void **edid)
> {
> --
> 1.8.1.4
>
>
Thanks.
--
Dmitry
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