drm/amd/display: add protection in link encoder matching logic
[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>
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8a46b84..c0ab232 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -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 =
