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| author | Hans de Goede <hdegoede@redhat.com> | 2022-06-20 11:49:57 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2022-09-03 12:17:27 +0200 |
| commit | 77ab9d4d44cd235322d2f30b1c4026302c3ce8c6 (patch) | |
| tree | 377363c899a3a549cc1f4880ff4e5dbb492db193 /include/acpi | |
| parent | 8991d7d9add0d9a711db692458d950050b38307b (diff) | |
| download | lwn-77ab9d4d44cd235322d2f30b1c4026302c3ce8c6.tar.gz lwn-77ab9d4d44cd235322d2f30b1c4026302c3ce8c6.zip | |
ACPI: video: Remove acpi_video_set_dmi_backlight_type()
acpi_video_set_dmi_backlight_type() is troublesome because it may end
up getting called after other backlight drivers have already called
acpi_video_get_backlight_type() resulting in the other drivers
already being registered even though they should not.
In case of the acpi_video backlight, acpi_video_set_dmi_backlight_type()
actually calls acpi_video_unregister_backlight() since that is often
probed earlier, leading to userspace seeing the acpi_video0 class
device being briefly available, leading to races in userspace where
udev probe-rules try to access the device and it is already gone.
All callers have been fixed to no longer call it, so remove
acpi_video_set_dmi_backlight_type() now.
This means we now also no longer need acpi_video_unregister_backlight()
for the remove acpi_video backlight after it was wrongly registered hack,
so remove that too.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/video.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/include/acpi/video.h b/include/acpi/video.h index dbd48cb8bd23..a275c35e5249 100644 --- a/include/acpi/video.h +++ b/include/acpi/video.h @@ -60,7 +60,6 @@ extern int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, void **edid); extern enum acpi_backlight_type acpi_video_get_backlight_type(void); extern bool acpi_video_backlight_use_native(void); -extern void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type); /* * Note: The value returned by acpi_video_handles_brightness_key_presses() * may change over time and should not be cached. @@ -86,9 +85,6 @@ static inline bool acpi_video_backlight_use_native(void) { return true; } -static inline void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) -{ -} static inline bool acpi_video_handles_brightness_key_presses(void) { return false; |