Make acpi_video_set_dmi_backlight_type() call acpi_video_unregister_backlight() when the new dmi quirk results in the desired backlight interface being of a type other then acpi_backlight_video.
This avoid the need for the second if in the following construction which is currently found in many platform/x86 drivers:
if (prefer_vendor_quirk) acpi_video_dmi_promote_vendor();
if (!acpi_video_backlight_support()) acpi_video_unregister_backlight()
This second if-block will be removed from the platform drivers as part of their conversion to the new backlight interface selection API.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/acpi/video_detect.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index 1ae7536..2807bbf 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -183,6 +183,9 @@ EXPORT_SYMBOL(acpi_video_get_backlight_type); void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) { acpi_backlight_dmi = type; + /* Remove acpi-video backlight interface if it is no longer desired */ + if (acpi_video_get_backlight_type() != acpi_backlight_video) + acpi_video_unregister_backlight(); } EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);