Hello David Francis,
This is a semi-automatic email about new static checker warnings.
The patch 8a48b44cd00f: "drm/amd/display: Call into DC once per
multiplane flip" from Dec 11, 2018, leads to the following Smatch
complaint:
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4763 amdgpu_dm_commit_planes()
warn: variable dereferenced before check 'acrtc_state->stream' (see line 4748)
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c
4747
4748 stream_status = dc_stream_get_status(acrtc_state->stream);
^^^^^^^^^^^^^^^^^^^
New unchecked dereference inside function.
4749 if (!stream_status) {
4750 DRM_ERROR("No stream status for CRTC: id=%d\n",
4751 acrtc_attach->crtc_id);
4752 continue;
4753 }
4754
4755 surface = stream_status->plane_states[0];
4756 flip->surface_updates[flip_count].surface = surface;
4757 if (!flip->surface_updates[flip_count].surface) {
4758 DRM_ERROR("No surface for CRTC: id=%d\n",
4759 acrtc_attach->crtc_id);
4760 continue;
4761 }
4762
4763 if (acrtc_state->stream)
^^^^^^^^^^^^^^^^^^^
New check is too late.
4764 update_freesync_state_on_stream(
4765 dm,
regards,
dan carpenter
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