Hi Kyle, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [cannot apply to v5.3 next-20190919] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Kyle-Tso/usb-typec-tcpm-AMS-and-Collision-Avoidance/20190920-112652 config: i386-allmodconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-13) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 :::::: branch date: 7 hours ago :::::: commit date: 7 hours ago If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/usb/typec/tcpm/tcpm.c: In function 'tcpm_ams_start': >> drivers/usb/typec/tcpm/tcpm.c:1144:5: warning: 'cc_req' may be used uninitialized in this function [-Wmaybe-uninitialized] tcpm_set_state(port, AMS_START, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc_req == SINK_TX_OK ? ~~~~~~~~~~~~~~~~~~~~~~ PD_T_SINK_TX : 0); ~~~~~~~~~~~~~~~~~ # https://github.com/0day-ci/linux/commit/59e8594ebb63b2f2f6d8ec5a9c9c914f6c476cae git remote add linux-review https://github.com/0day-ci/linux git remote update linux-review git checkout 59e8594ebb63b2f2f6d8ec5a9c9c914f6c476cae vim +/cc_req +1144 drivers/usb/typec/tcpm/tcpm.c 0ea47e4d06fe89 Kyle Tso 2019-09-20 1095 0ea47e4d06fe89 Kyle Tso 2019-09-20 1096 static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams) 0ea47e4d06fe89 Kyle Tso 2019-09-20 1097 { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1098 int ret = 0; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1099 0ea47e4d06fe89 Kyle Tso 2019-09-20 1100 tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1101 0ea47e4d06fe89 Kyle Tso 2019-09-20 1102 if (!tcpm_ams_interruptible(port) && ams != HARD_RESET) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1103 port->upcoming_state = INVALID_STATE; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1104 tcpm_log(port, "AMS %s not interruptible, aborting", 0ea47e4d06fe89 Kyle Tso 2019-09-20 1105 tcpm_ams_str[port->ams]); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1106 return -EAGAIN; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1107 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1108 0ea47e4d06fe89 Kyle Tso 2019-09-20 1109 if (port->pwr_role == TYPEC_SOURCE) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1110 enum typec_cc_status cc_req; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1111 0ea47e4d06fe89 Kyle Tso 2019-09-20 1112 port->ams = ams; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1113 0ea47e4d06fe89 Kyle Tso 2019-09-20 1114 if (ams == HARD_RESET) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1115 tcpm_set_cc(port, tcpm_rp_cc(port)); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1116 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1117 tcpm_set_state(port, HARD_RESET_START, 0); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1118 return ret; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1119 } else if (ams == SOFT_RESET_AMS) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1120 if (!port->explicit_contract) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1121 port->upcoming_state = INVALID_STATE; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1122 tcpm_set_cc(port, tcpm_rp_cc(port)); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1123 return ret; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1124 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1125 } else if (tcpm_vdm_ams(port)) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1126 /* tSinkTx is enforced in vdm_run_state_machine */ 59e8594ebb63b2 Kyle Tso 2019-09-20 1127 if (port->negotiated_rev >= PD_REV30) 0ea47e4d06fe89 Kyle Tso 2019-09-20 1128 tcpm_set_cc(port, SINK_TX_NG); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1129 return ret; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1130 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1131 59e8594ebb63b2 Kyle Tso 2019-09-20 1132 if (port->negotiated_rev >= PD_REV30) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1133 cc_req = port->cc_req; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1134 tcpm_set_cc(port, SINK_TX_NG); 59e8594ebb63b2 Kyle Tso 2019-09-20 1135 } 59e8594ebb63b2 Kyle Tso 2019-09-20 1136 59e8594ebb63b2 Kyle Tso 2019-09-20 1137 switch (port->state) { 59e8594ebb63b2 Kyle Tso 2019-09-20 1138 case SRC_READY: 59e8594ebb63b2 Kyle Tso 2019-09-20 1139 case SRC_STARTUP: 59e8594ebb63b2 Kyle Tso 2019-09-20 1140 case SRC_SOFT_RESET_WAIT_SNK_TX: 59e8594ebb63b2 Kyle Tso 2019-09-20 1141 case SOFT_RESET: 59e8594ebb63b2 Kyle Tso 2019-09-20 1142 case SOFT_RESET_SEND: 59e8594ebb63b2 Kyle Tso 2019-09-20 1143 if (port->negotiated_rev >= PD_REV30) 59e8594ebb63b2 Kyle Tso 2019-09-20 @1144 tcpm_set_state(port, AMS_START, 59e8594ebb63b2 Kyle Tso 2019-09-20 1145 cc_req == SINK_TX_OK ? 0ea47e4d06fe89 Kyle Tso 2019-09-20 1146 PD_T_SINK_TX : 0); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1147 else 59e8594ebb63b2 Kyle Tso 2019-09-20 1148 tcpm_set_state(port, AMS_START, 0); 59e8594ebb63b2 Kyle Tso 2019-09-20 1149 break; 59e8594ebb63b2 Kyle Tso 2019-09-20 1150 default: 59e8594ebb63b2 Kyle Tso 2019-09-20 1151 if (port->negotiated_rev >= PD_REV30) 59e8594ebb63b2 Kyle Tso 2019-09-20 1152 tcpm_set_state(port, SRC_READY, 59e8594ebb63b2 Kyle Tso 2019-09-20 1153 cc_req == SINK_TX_OK ? 0ea47e4d06fe89 Kyle Tso 2019-09-20 1154 PD_T_SINK_TX : 0); 59e8594ebb63b2 Kyle Tso 2019-09-20 1155 else 59e8594ebb63b2 Kyle Tso 2019-09-20 1156 tcpm_set_state(port, SRC_READY, 0); 59e8594ebb63b2 Kyle Tso 2019-09-20 1157 break; 59e8594ebb63b2 Kyle Tso 2019-09-20 1158 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1159 } else { 59e8594ebb63b2 Kyle Tso 2019-09-20 1160 if (port->negotiated_rev >= PD_REV30 && 59e8594ebb63b2 Kyle Tso 2019-09-20 1161 !tcpm_sink_tx_ok(port) && 0ea47e4d06fe89 Kyle Tso 2019-09-20 1162 ams != SOFT_RESET_AMS && 0ea47e4d06fe89 Kyle Tso 2019-09-20 1163 ams != HARD_RESET) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1164 port->upcoming_state = INVALID_STATE; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1165 tcpm_log(port, "Sink TX No Go"); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1166 return -EAGAIN; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1167 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1168 0ea47e4d06fe89 Kyle Tso 2019-09-20 1169 port->ams = ams; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1170 0ea47e4d06fe89 Kyle Tso 2019-09-20 1171 if (ams == HARD_RESET) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1172 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1173 tcpm_set_state(port, HARD_RESET_START, 0); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1174 return ret; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1175 } else if (tcpm_vdm_ams(port)) { 0ea47e4d06fe89 Kyle Tso 2019-09-20 1176 return ret; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1177 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1178 0ea47e4d06fe89 Kyle Tso 2019-09-20 1179 if (port->state == SNK_READY || 0ea47e4d06fe89 Kyle Tso 2019-09-20 1180 port->state == SNK_SOFT_RESET) 0ea47e4d06fe89 Kyle Tso 2019-09-20 1181 tcpm_set_state(port, AMS_START, 0); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1182 else 0ea47e4d06fe89 Kyle Tso 2019-09-20 1183 tcpm_set_state(port, SNK_READY, 0); 0ea47e4d06fe89 Kyle Tso 2019-09-20 1184 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1185 0ea47e4d06fe89 Kyle Tso 2019-09-20 1186 return ret; 0ea47e4d06fe89 Kyle Tso 2019-09-20 1187 } 0ea47e4d06fe89 Kyle Tso 2019-09-20 1188 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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