1 files changed, 8 insertions, 59 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 6dd237e79b4f..0ec434d2586d 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -911,7 +911,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
         if (acpi_video_init_brightness(device))
                 return;
 
-        if (acpi_video_verify_backlight_support()) {
+        if (acpi_video_backlight_support()) {
                 struct backlight_properties props;
                 struct pci_dev *pdev;
                 acpi_handle acpi_parent;
@@ -1366,8 +1366,8 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
         unsigned long long level_current, level_next;
         int result = -EINVAL;
 
-        /* no warning message if acpi_backlight=vendor or a quirk is used */
-        if (!acpi_video_verify_backlight_support())
+        /* no warning message if acpi_backlight=vendor is used */
+        if (!acpi_video_backlight_support())
                 return 0;
 
         if (!device->brightness)
@@ -1875,46 +1875,6 @@ static int acpi_video_bus_remove(struct acpi_device *device)
         return 0;
 }
 
-static acpi_status video_unregister_backlight(acpi_handle handle, u32 lvl,
-                                              void *context, void **rv)
-{
-        struct acpi_device *acpi_dev;
-        struct acpi_video_bus *video;
-        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))
-                return AE_OK;
-
-        video = acpi_driver_data(acpi_dev);
-        if (!video)
-                return AE_OK;
-
-        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);
-                }
-                if (dev->cooling_dev) {
-                        sysfs_remove_link(&dev->dev->dev.kobj,
-                                          "thermal_cooling");
-                        sysfs_remove_link(&dev->cooling_dev->device.kobj,
-                                          "device");
-                        thermal_cooling_device_unregister(dev->cooling_dev);
-                        dev->cooling_dev = NULL;
-                }
-        }
-        mutex_unlock(&video->device_list_lock);
-        acpi_video_bus_start_devices(video);
-        return AE_OK;
-}
-
 static int __init is_i740(struct pci_dev *dev)
 {
         if (dev->device == 0x00D1)
@@ -1946,25 +1906,14 @@ static int __init intel_opregion_present(void)
         return opregion;
 }
 
-int __acpi_video_register(bool backlight_quirks)
+int acpi_video_register(void)
 {
-        bool no_backlight;
-        int result;
-
-        no_backlight = backlight_quirks ? acpi_video_backlight_quirks() : false;
-
+        int result = 0;
         if (register_count) {
                 /*
-                 * If acpi_video_register() has been called already, don't try
-                 * to register acpi_video_bus, but unregister backlight devices
-                 * if no backlight support is requested.
+                 * if the function of acpi_video_register is already called,
+                 * don't register the acpi_vide_bus again and return no error.
                  */
-                if (no_backlight)
-                        acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
-                                            ACPI_UINT32_MAX,
-                                            video_unregister_backlight,
-                                            NULL, NULL, NULL);
-
                 return 0;
         }
 
@@ -1980,7 +1929,7 @@ int __acpi_video_register(bool backlight_quirks)
 
         return 0;
 }
-EXPORT_SYMBOL(__acpi_video_register);
+EXPORT_SYMBOL(acpi_video_register);
 
 void acpi_video_unregister(void)
 {