tree: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/err head: 62a5549bfad79bd0bc6000edfdaaaf7049e8e6ce commit: fdce092f478020e0e84b6743639d83a957e03ad1 [11/16] PCI/ERR: Recover from RCEC AER errors config: x86_64-randconfig-r015-20201204 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 32c501dd88b62787d3a5ffda7aabcf4650dbe3cd) reproduce (this is a W=1 build): 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 # https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?id=fdce092f478020e0e84b6743639d83a957e03ad1 git remote add pci https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git git fetch --no-tags pci pci/err git checkout fdce092f478020e0e84b6743639d83a957e03ad1 # 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: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/pci/pcie/aer.c:1387:7: warning: variable 'rc' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (pcie_has_flr(dev)) { ^~~~~~~~~~~~~~~~~ drivers/pci/pcie/aer.c:1409:9: note: uninitialized use occurs here return rc ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED; ^~ drivers/pci/pcie/aer.c:1387:3: note: remove the 'if' if its condition is always true if (pcie_has_flr(dev)) { ^~~~~~~~~~~~~~~~~~~~~~~ drivers/pci/pcie/aer.c:1374:8: note: initialize the variable 'rc' to silence this warning int rc; ^ = 0 1 warning generated. vim +1387 drivers/pci/pcie/aer.c 1360 1361 /** 1362 * aer_root_reset - reset Root Port hierarchy or RCEC 1363 * @dev: pointer to Root Port or RCEC 1364 * 1365 * Invoked by Port Bus driver when performing reset. 1366 */ 1367 static pci_ers_result_t aer_root_reset(struct pci_dev *dev) 1368 { 1369 int type = pci_pcie_type(dev); 1370 struct pci_dev *root; 1371 int aer; 1372 struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); 1373 u32 reg32; 1374 int rc; 1375 1376 root = dev; /* device with Root Error registers */ 1377 aer = root->aer_cap; 1378 1379 if ((host->native_aer || pcie_ports_native) && aer) { 1380 /* Disable Root's interrupt in response to error messages */ 1381 pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, ®32); 1382 reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; 1383 pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32); 1384 } 1385 1386 if (type == PCI_EXP_TYPE_RC_EC) { > 1387 if (pcie_has_flr(dev)) { 1388 rc = pcie_flr(dev); 1389 pci_info(dev, "has been reset (%d)\n", rc); 1390 } else { 1391 pci_info(dev, "not reset (no FLR support)\n"); 1392 } 1393 } else { 1394 rc = pci_bus_error_reset(dev); 1395 pci_info(dev, "Root Port link has been reset (%d)\n", rc); 1396 } 1397 1398 if ((host->native_aer || pcie_ports_native) && aer) { 1399 /* Clear Root Error Status */ 1400 pci_read_config_dword(root, aer + PCI_ERR_ROOT_STATUS, ®32); 1401 pci_write_config_dword(root, aer + PCI_ERR_ROOT_STATUS, reg32); 1402 1403 /* Enable Root Port's interrupt in response to error messages */ 1404 pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, ®32); 1405 reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; 1406 pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32); 1407 } 1408 1409 return rc ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED; 1410 } 1411 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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