Hello Nicholas Kazlauskas,
This is a semi-automatic email about new static checker warnings.
The patch 0f80e7cdc012: "drm/amd/display: Register DMUB service with
DC" from Oct 28, 2019, leads to the following Smatch complaint:
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:1049
amdgpu_dm_fini()
warn: variable dereferenced before check 'adev->dm.dc' (see line 1038)
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c
1029 #ifdef CONFIG_DRM_AMD_DC_HDCP
1030 if (adev->dm.hdcp_workqueue) {
1031 hdcp_destroy(adev->dm.hdcp_workqueue);
1032 adev->dm.hdcp_workqueue = NULL;
1033 }
1034
1035 if (adev->dm.dc)
^^^^^^^^^^^
Check
1036 dc_deinit_callbacks(adev->dm.dc);
1037 #endif
1038 if (adev->dm.dc->ctx->dmub_srv) {
^^^^^^^^^^^^^^^^
Unchecked dereference
1039 dc_dmub_srv_destroy(&adev->dm.dc->ctx->dmub_srv);
1040 adev->dm.dc->ctx->dmub_srv = NULL;
1041 }
1042
1043 if (adev->dm.dmub_bo)
1044 amdgpu_bo_free_kernel(&adev->dm.dmub_bo,
1045 &adev->dm.dmub_bo_gpu_addr,
1046 &adev->dm.dmub_bo_cpu_addr);
1047
1048 /* DC Destroy TODO: Replace destroy DAL */
1049 if (adev->dm.dc)
^^^^^^^^^^^
Check
1050 dc_destroy(&adev->dm.dc);
1051 /*
regards,
dan carpenter
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