Hello Harry Wentland,
This is a semi-automatic email about new static checker warnings.
The patch 4562236b3bc0: "drm/amd/dc: Add dc display driver (v2)" from
Sep 12, 2017, leads to the following Smatch complaint:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:754 construct()
error: we previously assumed 'dc->current_state' could be null (see line 677)
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c
676
677 if (!dc->current_state) {
^^^^^^^^^^^^^^^^^^
678 dm_error("%s: failed to create validate ctx\n", __func__);
679 goto fail;
^^^^^^^^^
680 }
681
682 /* Create logger */
683
684 dc_ctx->dce_environment = init_params->dce_environment;
685
686 dc_version = resource_parse_asic_id(init_params->asic_id);
687 dc_ctx->dce_version = dc_version;
688
689 /* Resource should construct all asic specific resources.
690 * This should be the only place where we need to parse the asic id
691 */
692 if (init_params->vbios_override)
693 dc_ctx->dc_bios = init_params->vbios_override;
694 else {
695 /* Create BIOS parser */
696 struct bp_init_data bp_init_data;
697
698 bp_init_data.ctx = dc_ctx;
699 bp_init_data.bios = init_params->asic_id.atombios_base_address;
700
701 dc_ctx->dc_bios = dal_bios_parser_create(
702 &bp_init_data, dc_version);
703
704 if (!dc_ctx->dc_bios) {
705 ASSERT_CRITICAL(false);
706 goto fail;
707 }
708
709 dc_ctx->created_bios = true;
710 }
711
712 /* Create I2C AUX */
713 dc_ctx->i2caux = dal_i2caux_create(dc_ctx);
714
715 if (!dc_ctx->i2caux) {
716 ASSERT_CRITICAL(false);
717 goto fail;
718 }
719
720 dc_ctx->perf_trace = dc_perf_trace_create();
721 if (!dc_ctx->perf_trace) {
722 ASSERT_CRITICAL(false);
723 goto fail;
724 }
725
726 /* Create GPIO service */
727 dc_ctx->gpio_service = dal_gpio_service_create(
728 dc_version,
729 dc_ctx->dce_environment,
730 dc_ctx);
731
732 if (!dc_ctx->gpio_service) {
733 ASSERT_CRITICAL(false);
734 goto fail;
735 }
736
737 dc->res_pool = dc_create_resource_pool(
738 dc,
739 init_params->num_virtual_links,
740 dc_version,
741 init_params->asic_id);
742 if (!dc->res_pool)
743 goto fail;
744
745 dc_resource_state_construct(dc, dc->current_state);
746
747 if (!create_links(dc, init_params->num_virtual_links))
748 goto fail;
749
750 return true;
751
752 fail:
753
754 destruct(dc);
^^
"dc->current_state" gets dereferenced inside the function. This style
of one function cleans up everything error handling is always buggy...
:/
https://plus.google.com/u/0/106378716002406849458/posts/1Ud9JbaYnPr
755 return false;
756 }
regards,
dan carpenter
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