Hi Fangzhi, kernel test robot noticed the following build warnings: https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Fangzhi-Zuo/drm-display-dsc-Refactor-DRM-MST-DSC-Determination-Policy/20241106-230854 base: git://anongit.freedesktop.org/drm/drm drm-next patch link: https://lore.kernel.org/r/20241106150444.424579-2-Jerry.Zuo%40amd.com patch subject: [PATCH v3 1/2] drm/display/dsc: Refactor DRM MST DSC Determination Policy config: i386-randconfig-141-20241107 (https://download.01.org/0day-ci/archive/20241107/202411071102.0CMTIEIo-lkp@xxxxxxxxx/config) compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> | Closes: https://lore.kernel.org/r/202411071102.0CMTIEIo-lkp@xxxxxxxxx/ smatch warnings: drivers/gpu/drm/display/drm_dp_mst_topology.c:6043 drm_dp_mst_dsc_aux_for_port() warn: variable dereferenced before check 'port' (see line 6033) vim +/port +6043 drivers/gpu/drm/display/drm_dp_mst_topology.c c2bc1b6eabe65d drivers/gpu/drm/drm_dp_mst_topology.c David Francis 2019-08-26 6031 struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) c2bc1b6eabe65d drivers/gpu/drm/drm_dp_mst_topology.c David Francis 2019-08-26 6032 { fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 @6033 struct drm_dp_mst_topology_mgr *mgr = port->mgr; ^^^^^^^^^ Dereferenced fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 6034 struct drm_dp_mst_port *immediate_upstream_port = NULL; fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 6035 struct drm_dp_mst_port *fec_port = NULL; fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 6036 struct drm_dp_mst_port *dsc_port = NULL; fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 6037 struct drm_dp_aux *upstream_aux; fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 6038 bool end_has_dpcd = (port->dpcd_rev > 0); fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 6039 u8 endpoint_dsc = 0; 70a6587dca37a3 drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2024-09-09 6040 u8 upstream_dsc; fd05275592ae07 drivers/gpu/drm/display/drm_dp_mst_topology.c Fangzhi Zuo 2024-11-06 6041 u8 fec_cap; c2bc1b6eabe65d drivers/gpu/drm/drm_dp_mst_topology.c David Francis 2019-08-26 6042 c2bc1b6eabe65d drivers/gpu/drm/drm_dp_mst_topology.c David Francis 2019-08-26 @6043 if (!port) ^^^^^ Checked too late. -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
