drm/amd/display: fix NULL checks for adev->dm.dc in amdgpu_dm_fini()

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Since 'adev->dm.dc' in amdgpu_dm_fini() might turn out to be NULL
before the call to dc_enable_dmub_notifications(), check
beforehand to ensure there will not be a possible NULL-ptr-deref
there.

Also, since commit 1e88eb1b2c ("drm/amd/display: Drop
CONFIG_DRM_AMD_DC_HDCP") there are two separate checks for NULL in
'adev->dm.dc' before dc_deinit_callbacks() and dc_dmub_srv_destroy().
Clean up by combining them all under one 'if'.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: 81927e2808 ("drm/amd/display: Support for DMUB AUX")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Nikita Zhandarovich 2024-02-06 08:50:56 -08:00 • committed by Alex Deucher

parent c4891d979c

commit 2a3cfb9a24

1 changed files with 7 additions and 9 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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