Hi Sergei, Thank you for the patch! Yet something to improve: [auto build test ERROR on a409ed156a90093a03fe6a93721ddf4c591eac87] url: https://github.com/0day-ci/linux/commits/Sergei-Miroshnichenko/PCI-Allow-... base: a409ed156a90093a03fe6a93721ddf4c591eac87 config: powerpc-randconfig-r036-20201218 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://github.com/0day-ci/linux/commit/2459b758d22bc2c5d20ddcbd857613a62... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sergei-Miroshnichenko/PCI-Allow-BAR-movement-during-boot-and-hotplug/20201219-014810 git checkout 2459b758d22bc2c5d20ddcbd857613a624cfecdd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): mutex_lock_nested(&dev->enable_mutex, pci_bridge_depth(dev)); ^ 1 error generated. vim +/pci_bridge_depth +1864 drivers/pci/pci.c 1858 1859 static void pci_enable_bridge(struct pci_dev *dev) 1860 { 1861 struct pci_dev *bridge; 1862 int retval; 1863 1865 1866 bridge = pci_upstream_bridge(dev); 1867 if (bridge) 1868 pci_enable_bridge(bridge); 1869 1870 if (pci_is_enabled(dev)) { 1871 if (!dev->is_busmaster) 1872 pci_set_master(dev); 1873 mutex_unlock(&dev->enable_mutex); 1874 return; 1875 } 1876 1877 retval = pci_enable_device(dev); 1878 if (retval) 1879 pci_err(dev, "Error enabling bridge (%d), continuing\n", 1880 retval); 1881 pci_set_master(dev); 1882 mutex_unlock(&dev->enable_mutex); 1883 } 1884 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org