Hi Thinh, Thank you for the patch! Yet something to improve: [auto build test ERROR on balbi-usb/next] [also build test ERROR on usb/usb-testing peter.chen-usb/ci-for-usb-next v5.7-rc5 next-20200515] [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/Thinh-Nguyen/usb-dwc3-gadget-Che... base: https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git next config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): drivers/usb/dwc3/gadget.c: In function 'dwc3_prepare_trbs': if (dep->stream_capable && req->request.is_last) ^ vim +1203 drivers/usb/dwc3/gadget.c 1166 1167 /* 1168 * dwc3_prepare_trbs - setup TRBs from requests 1169 * @dep: endpoint for which requests are being prepared 1170 * 1171 * The function goes through the requests list and sets up TRBs for the 1172 * transfers. The function returns once there are no more TRBs available or 1173 * it runs out of requests. 1174 */ 1175 static void dwc3_prepare_trbs(struct dwc3_ep *dep) 1176 { 1177 struct dwc3_request *req, *n; 1178 1179 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM); 1180 1181 /* 1182 * We can get in a situation where there's a request in the started list 1183 * but there weren't enough TRBs to fully kick it in the first time 1184 * around, so it has been waiting for more TRBs to be freed up. 1185 * 1186 * In that case, we should check if we have a request with pending_sgs 1187 * in the started list and prepare TRBs for that request first, 1188 * otherwise we will prepare TRBs completely out of order and that will 1189 * break things. 1190 */ 1191 list_for_each_entry(req, &dep->started_list, list) { 1192 if (req->num_pending_sgs > 0) 1193 dwc3_prepare_one_trb_sg(dep, req); 1194 1195 if (!dwc3_calc_trbs_left(dep)) 1196 return; 1197 1198 /* 1199 * Don't prepare beyond a transfer. In DWC_usb32, its transfer 1200 * burst capability may try to read and use TRBs beyond the 1201 * active transfer instead of stopping. 1202 */ 1204 return; 1205 } 1206 1207 list_for_each_entry_safe(req, n, &dep->pending_list, list) { 1208 struct dwc3 *dwc = dep->dwc; 1209 int ret; 1210 1211 ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request, 1212 dep->direction); 1213 if (ret) 1214 return; 1215 1216 req->sg = req->request.sg; 1217 req->start_sg = req->sg; 1218 req->num_queued_sgs = 0; 1219 req->num_pending_sgs = req->request.num_mapped_sgs; 1220 1221 if (req->num_pending_sgs > 0) 1222 dwc3_prepare_one_trb_sg(dep, req); 1223 else 1224 dwc3_prepare_one_trb_linear(dep, req); 1225 1226 if (!dwc3_calc_trbs_left(dep)) 1227 return; 1228 } 1229 } 1230 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org