Hi Matthias, I love your patch! Yet something to improve: [auto build test ERROR on usb/usb-testing] [also build test ERROR on robh/for-next char-misc/char-misc-testing v5.11-rc7 next-20210125] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Matthias-Kaehlcke/USB-misc-Add-o... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing config: xtensa-randconfig-r022-20210209 (attached as .config) compiler: xtensa-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/c9b9392a809153c27c7c936178f65cb18... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matthias-Kaehlcke/USB-misc-Add-onboard_usb_hub-driver/20210211-011551 git checkout c9b9392a809153c27c7c936178f65cb189b49f1a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 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 >>): xtensa-linux-ld: drivers/usb/host/xhci-plat.o: in function `xhci_plat_quirks': xtensa-linux-ld: drivers/usb/host/xhci-plat.o: in function `xhci_plat_remove': xhci-plat.c:(.text+0x2e2): undefined reference to `of_platform_device_destroy' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org