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drm/amd/display: add protection in link encoder matching logic

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[Why]
Link encoders are created based on its engine ID. The position of a link
encoder in an array could be null since it didn't be allocated.  Current
matching logic didn't consider this situation and could get null
encoder.

[How]
To add null encoder check to make the matching logic can go to next to
get a valid one.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Martin Tsai <martin.tsai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Martin Tsai
2022-01-23 13:19:58 -05:00
committed by Alex Deucher
parent 09ece5ac39
commit d715c9a2cb
7 changed files with 36 additions and 92 deletions
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2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -8366,7 +8366,7 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
break;
case DRM_MODE_CONNECTOR_DisplayPort:
aconnector->base.polled = DRM_CONNECTOR_POLL_HPD;
link->link_enc = dp_get_link_enc(link);
link->link_enc = link_enc_cfg_get_link_enc(link);
ASSERT(link->link_enc);
if (link->link_enc)
aconnector->base.ycbcr_420_allowed =