Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bluetooth/master] [also build test WARNING on bluetooth-next/master linus/master v6.0-rc5 next-20220912] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/sean-wang-mediatek-com/Bluetooth-btusb-mediatek-use-readx_poll_timeout-instead-of-open-coding/20220913-062200 base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git master config: m68k-randconfig-r033-20220911 (https://download.01.org/0day-ci/archive/20220913/202209131812.1EOjfRYn-lkp@xxxxxxxxx/config) compiler: m68k-linux-gcc (GCC) 12.1.0 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/intel-lab-lkp/linux/commit/d478461e2fd5fdd8d505c00c7864a421170a54bb git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review sean-wang-mediatek-com/Bluetooth-btusb-mediatek-use-readx_poll_timeout-instead-of-open-coding/20220913-062200 git checkout d478461e2fd5fdd8d505c00c7864a421170a54bb # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from drivers/bluetooth/btusb.c:28: >> drivers/bluetooth/btmtk.h:172:6: warning: no previous prototype for 'btmtk_register_coredump' [-Wmissing-prototypes] 172 | void btmtk_register_coredump(struct hci_dev *hdev, u32 dev_id, const char *name, | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/btmtk_register_coredump +172 drivers/bluetooth/btmtk.h 171 > 172 void btmtk_register_coredump(struct hci_dev *hdev, u32 dev_id, const char *name, 173 u32 fw_version) 174 { 175 } 176 -- 0-DAY CI Kernel Test Service https://01.org/lkp