tree: git://linuxtv.org/media_tree.git master head: 960b2dee908b0fc51cf670841de13b40b44aaaae commit: 09d87466655d00526cf818b3f3b267884c591702 [465/495] media: atomisp: reduce the risk of a race condition config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e6658079aca6d971b4e9d7137a3a2ecbc9c34aec) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 09d87466655d00526cf818b3f3b267884c591702 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): count++; ^ drivers/staging/media/atomisp/pci/atomisp_v4l2.c:1189:57: note: incremented here for (count = 0; count < SUBDEV_WAIT_TIMEOUT_MAX_COUNT; count++) { ^ 1 warning generated. vim +/count +1193 drivers/staging/media/atomisp/pci/atomisp_v4l2.c 1084 1085 static int atomisp_subdev_probe(struct atomisp_device *isp) 1086 { 1087 const struct atomisp_platform_data *pdata; 1088 struct intel_v4l2_subdev_table *subdevs; 1089 int ret, raw_index = -1, count; 1090 1091 pdata = atomisp_get_platform_data(); 1092 if (!pdata) { 1093 dev_err(isp->dev, "no platform data available\n"); 1094 return 0; 1095 } 1096 1097 /* FIXME: should, instead, use I2C probe */ 1098 1099 for (subdevs = pdata->subdevs; subdevs->type; ++subdevs) { 1100 struct v4l2_subdev *subdev; 1101 struct i2c_board_info *board_info = 1102 &subdevs->v4l2_subdev.board_info; 1103 struct i2c_adapter *adapter = 1104 i2c_get_adapter(subdevs->v4l2_subdev.i2c_adapter_id); 1105 int sensor_num, i; 1106 1107 dev_info(isp->dev, "Probing Subdev %s\n", board_info->type); 1108 1109 if (!adapter) { 1110 dev_err(isp->dev, 1111 "Failed to find i2c adapter for subdev %s\n", 1112 board_info->type); 1113 break; 1114 } 1115 1116 /* In G-Min, the sensor devices will already be probed 1117 * (via ACPI) and registered, do not create new 1118 * ones */ 1119 subdev = atomisp_gmin_find_subdev(adapter, board_info); 1120 ret = v4l2_device_register_subdev(&isp->v4l2_dev, subdev); 1121 if (ret) { 1122 dev_warn(isp->dev, "Subdev %s detection fail\n", 1123 board_info->type); 1124 continue; 1125 } 1126 1127 if (!subdev) { 1128 dev_warn(isp->dev, "Subdev %s detection fail\n", 1129 board_info->type); 1130 continue; 1131 } 1132 1133 dev_info(isp->dev, "Subdev %s successfully register\n", 1134 board_info->type); 1135 1136 switch (subdevs->type) { 1137 case RAW_CAMERA: 1138 raw_index = isp->input_cnt; 1139 dev_dbg(isp->dev, "raw_index: %d\n", raw_index); 1140 case SOC_CAMERA: 1141 dev_dbg(isp->dev, "SOC_INDEX: %d\n", isp->input_cnt); 1142 if (isp->input_cnt >= ATOM_ISP_MAX_INPUTS) { 1143 dev_warn(isp->dev, 1144 "too many atomisp inputs, ignored\n"); 1145 break; 1146 } 1147 1148 isp->inputs[isp->input_cnt].type = subdevs->type; 1149 isp->inputs[isp->input_cnt].port = subdevs->port; 1150 isp->inputs[isp->input_cnt].camera = subdev; 1151 isp->inputs[isp->input_cnt].sensor_index = 0; 1152 /* 1153 * initialize the subdev frame size, then next we can 1154 * judge whether frame_size store effective value via 1155 * pixel_format. 1156 */ 1157 isp->inputs[isp->input_cnt].frame_size.pixel_format = 0; 1158 isp->inputs[isp->input_cnt].camera_caps = 1159 atomisp_get_default_camera_caps(); 1160 sensor_num = isp->inputs[isp->input_cnt] 1161 .camera_caps->sensor_num; 1162 isp->input_cnt++; 1163 for (i = 1; i < sensor_num; i++) { 1164 if (isp->input_cnt >= ATOM_ISP_MAX_INPUTS) { 1165 dev_warn(isp->dev, 1166 "atomisp inputs out of range\n"); 1167 break; 1168 } 1169 isp->inputs[isp->input_cnt] = 1170 isp->inputs[isp->input_cnt - 1]; 1171 isp->inputs[isp->input_cnt].sensor_index = i; 1172 isp->input_cnt++; 1173 } 1174 break; 1175 case CAMERA_MOTOR: 1176 isp->motor = subdev; 1177 break; 1178 case LED_FLASH: 1179 case XENON_FLASH: 1180 isp->flash = subdev; 1181 break; 1182 default: 1183 dev_dbg(isp->dev, "unknown subdev probed\n"); 1184 break; 1185 } 1186 } 1187 1188 /* FIXME: should return -EPROBE_DEFER if not all subdevs were probed */ 1189 for (count = 0; count < SUBDEV_WAIT_TIMEOUT_MAX_COUNT; count++) { 1190 if (isp->input_cnt) 1191 break; 1192 msleep(SUBDEV_WAIT_TIMEOUT); 1194 } 1195 /* Wait more time to give more time for subdev init code */ 1196 msleep(5 * SUBDEV_WAIT_TIMEOUT); 1197 1198 /* 1199 * HACK: Currently VCM belongs to primary sensor only, but correct 1200 * approach must be to acquire from platform code which sensor 1201 * owns it. 1202 */ 1203 if (isp->motor && raw_index >= 0) 1204 isp->inputs[raw_index].motor = isp->motor; 1205 1206 /* Proceed even if no modules detected. For COS mode and no modules. */ 1207 if (!isp->input_cnt) 1208 dev_warn(isp->dev, "no camera attached or fail to detect\n"); 1209 else 1210 dev_info(isp->dev, "detected %d camera sensors\n", 1211 isp->input_cnt); 1212 1213 return atomisp_csi_lane_config(isp); 1214 } 1215 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org