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

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[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
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3
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@ -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)