Hello Wyatt Wood,
This is a semi-automatic email about new static checker warnings.
The patch 4dc079787b23: "drm/amd/display: Use dmub fw to lock pipe,
cursor, dig" from May 27, 2020, leads to the following Smatch
complaint:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:4091 dc_link_dp_set_test_pattern()
warn: variable dereferenced before check 'pipe_ctx->stream' (see line 4068)
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c
4067 color_space,
4068 pipe_ctx->stream->use_vsc_sdp_for_colorimetry,
4069 link->dpcd_caps.dprx_feature.bits.SST_SPLIT_SDP_CAP);
4070
4071 if (pipe_ctx->stream->use_vsc_sdp_for_colorimetry) {
^^^^^^^^^^^^^^^^^^
This is dereferenced in the original code.
4072 if (test_pattern == DP_TEST_PATTERN_COLOR_SQUARES_CEA)
4073 pipe_ctx->stream->vsc_infopacket.sb[17] |= (1 << 7); // sb17 bit 7 Dynamic Range: 0 = VESA range, 1 = CTA range
4074 else
4075 pipe_ctx->stream->vsc_infopacket.sb[17] &= ~(1 << 7);
4076 resource_build_info_frame(pipe_ctx);
4077 link->dc->hwss.update_info_frame(pipe_ctx);
4078 }
4079
4080 /* CRTC Patterns */
4081 set_crtc_test_pattern(link, pipe_ctx, test_pattern, test_pattern_color_space);
4082 pipe_ctx->stream_res.tg->funcs->unlock(pipe_ctx->stream_res.tg);
4083 pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg,
4084 CRTC_STATE_VACTIVE);
4085 pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg,
4086 CRTC_STATE_VBLANK);
4087 pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg,
4088 CRTC_STATE_VACTIVE);
4089
4090 if (pipe_ctx->stream_res.tg->funcs->lock_doublebuffer_disable) {
4091 if (pipe_ctx->stream && should_use_dmub_lock(pipe_ctx->stream->link)) {
^^^^^^^^^^^^^^^^
The patch adds a new dereference, is it really required?
4092 union dmub_hw_lock_flags hw_locks = { 0 };
4093 struct dmub_hw_lock_inst_flags inst_flags = { 0 };
regards,
dan carpenter
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