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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11

drivers/gpu/drm/amd/display/dc/core/dc_link.c

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66

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

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23

drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c

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22

drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c

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1

drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h

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3

drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h

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