On Thu, 09 Mar 2023, Dan Carpenter <error27@xxxxxxxxx> wrote: > Hello Jani Nikula, > > This is a semi-automatic email about new static checker warnings. > > The patch 1b28c1c789d0: "drm/i915/dmc: add i915_to_dmc() and > dmc->i915 and use them" from Mar 1, 2023, leads to the following > Smatch complaint: > > drivers/gpu/drm/i915/display/intel_dmc.c:1162 intel_dmc_debugfs_status_show() > error: we previously assumed 'dmc' could be null (see line 1148) > > drivers/gpu/drm/i915/display/intel_dmc.c > 1142 > 1143 wakeref = intel_runtime_pm_get(&i915->runtime_pm); > 1144 > 1145 seq_printf(m, "DMC initialized: %s\n", str_yes_no(dmc));' > ^^^^^^^^^^^^^^^ > This is a check for NULL too. > > 1146 seq_printf(m, "fw loaded: %s\n", > 1147 str_yes_no(intel_dmc_has_payload(i915))); > 1148 seq_printf(m, "path: %s\n", dmc ? dmc->fw_path : "N/A"); > ^^^ > The patch adds a check for NULL. > > 1149 seq_printf(m, "Pipe A fw needed: %s\n", > 1150 str_yes_no(GRAPHICS_VER(i915) >= 12)); > 1151 seq_printf(m, "Pipe A fw loaded: %s\n", > 1152 str_yes_no(has_dmc_id_fw(i915, DMC_FW_PIPEA))); > 1153 seq_printf(m, "Pipe B fw needed: %s\n", > 1154 str_yes_no(IS_ALDERLAKE_P(i915) || > 1155 DISPLAY_VER(i915) >= 14)); > 1156 seq_printf(m, "Pipe B fw loaded: %s\n", > 1157 str_yes_no(has_dmc_id_fw(i915, DMC_FW_PIPEB))); > 1158 > 1159 if (!intel_dmc_has_payload(i915)) intel_dmc_has_payload() should always return false for dmc == NULL. BR, Jani. > 1160 goto out; > 1161 > 1162 seq_printf(m, "version: %d.%d\n", DMC_VERSION_MAJOR(dmc->version), > ^^^^^^^^^^^^ > 1163 DMC_VERSION_MINOR(dmc->version)); > ^^^^^^^^^^^^ > Unchecked dereferences. > > 1164 > > regards, > dan carpenter -- Jani Nikula, Intel Open Source Graphics Center
