When acpi_video_register() has not run yet the video_bus_head will be empty, so there is no need to check the register_count flag first.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/acpi/acpi_video.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index 7f48352840bb..95d4868f6a8c 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -2259,14 +2259,10 @@ void acpi_video_unregister_backlight(void) { struct acpi_video_bus *video;
- mutex_lock(®ister_count_mutex); - if (register_count) { - mutex_lock(&video_list_lock); - list_for_each_entry(video, &video_bus_head, entry) - acpi_video_bus_unregister_backlight(video); - mutex_unlock(&video_list_lock); - } - mutex_unlock(®ister_count_mutex); + mutex_lock(&video_list_lock); + list_for_each_entry(video, &video_bus_head, entry) + acpi_video_bus_unregister_backlight(video); + mutex_unlock(&video_list_lock); }
bool acpi_video_handles_brightness_key_presses(void)