github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 00:22:00 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/amd/display: Avoid NULL pointer in set_backlight when ABM is NULL

Browse Source 
[Why]
On ASIC without ABM support (most dGPU) we run into a null pointer
dereference when attempting to set the backlight level.

[How]
This function requires ABM, so fix up the condition to only allow
DMCU to be optional.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Wyatt Wood <Wyatt.Wood@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2020-04-02 15:59:44 -04:00 committed by Alex Deucher
parent 39063de95c
commit f1029e7ead
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -2462,8 +2462,7 @@ bool dc_link_set_backlight_level(const struct dc_link *link,
int i;
DC_LOGGER_INIT(link->ctx->logger);
if ((dmcu == NULL && abm == NULL) ||
(abm->funcs->set_backlight_level_pwm == NULL))
if (abm == NULL || (abm->funcs->set_backlight_level_pwm == NULL))
return false;
if (dmcu)