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 <hdego...@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 0f9586b..d00c0f4 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);
--
2.3.6
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