drm/amd/display: Guard against ddc_pin being NULL for AUX

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[Why]
In the case where we don't support DMUB aux but we have DPIA links
in the configuration we might try to message AUX using the legacy
path - where DDC pin is NULL. This causes a NULL pointer dereference.

[How]
Guard against NULL DDC pin, return a failure for aux engine acquire.

Reviewed-by: Michael Strauss <Michael.Strauss@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Nicholas Kazlauskas 2022-06-09 13:30:42 -04:00 • committed by Alex Deucher

parent 7c50a3e99a

commit bc19909f19

1 changed files with 5 additions and 0 deletions

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drivers/gpu/drm/amd/display/dc/dce/dce_aux.c

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