Hi Matthew, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on wsa/i2c/for-next] [also build test WARNING on v5.7-rc4 next-20200508] [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/Matthew-Blecker/i2c-Add-i2c-pseudo-driver-for-userspace-I2C-adapters/20200509-011221 base: https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> coccinelle warnings: (new ones prefixed by >>) >> drivers/i2c/i2c-pseudo.c:2897:8-15: WARNING opportunity for memdup_user -- >> drivers/i2c/i2c-pseudo.c:2206:1-17: ERROR: i2cp_fileops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. Please review and possibly fold the followup patch. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx