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drm/amd/display: Fix NULL pointer on MST chained mode

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Prevent NULL pointer on new_stream being added to ctx
when added MST connectors cannot be found in existing crtc_state
in the chained mode

Signed-off-by: Jerry Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jerry Zuo 2017-09-08 16:40:34 -04:00 committed by Alex Deucher
parent f4ac176e62
commit fc17235fe6
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -4462,6 +4462,13 @@ static int dm_update_crtcs_state(struct dc *dc,
*lock_and_validation_needed = true;
} else {/* Add stream for any updated/enabled CRTC */
/*
* Quick fix to prevent NULL pointer on new_stream when
* added MST connectors not found in existing crtc_state in the chained mode
* TODO: need to dig out the root cause of that
*/
if (!aconnector || (!aconnector->dc_sink && aconnector->mst_port))
continue;
if (modereset_required(new_crtc_state))
goto next_crtc;