Hi Jimmy, url: https://github.com/0day-ci/linux/commits/Jimmy-Su/media-i2c-Add-ov08d10-c... base: git://linuxtv.org/media_tree.git master config: mips-randconfig-m031-20220113 (https://download.01.org/0day-ci/archive/20220114/202201142047.YegHpDOf-lk...) compiler: mips64el-linux-gcc (GCC) 11.2.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/media/i2c/ov08d10.c:833 ov08d10_set_ctrl_flip() warn: impossible condition '(val < 0) => (0-255 < 0)' vim +833 drivers/media/i2c/ov08d10.c 8c1d2ed3b617b8 Jimmy Su 2022-01-12 821 static int ov08d10_set_ctrl_flip(struct ov08d10 *ov08d10, u32 ctrl_val) 8c1d2ed3b617b8 Jimmy Su 2022-01-12 822 { 8c1d2ed3b617b8 Jimmy Su 2022-01-12 823 struct i2c_client *client = v4l2_get_subdevdata(&ov08d10->sd); 8c1d2ed3b617b8 Jimmy Su 2022-01-12 824 u8 val; ^^^^^^ 8c1d2ed3b617b8 Jimmy Su 2022-01-12 825 int ret; 8c1d2ed3b617b8 Jimmy Su 2022-01-12 826 8c1d2ed3b617b8 Jimmy Su 2022-01-12 827 /* System control registers */ 8c1d2ed3b617b8 Jimmy Su 2022-01-12 828 ret = i2c_smbus_write_byte_data(client, OV08D10_REG_PAGE, 0x01); 8c1d2ed3b617b8 Jimmy Su 2022-01-12 829 if (ret < 0) 8c1d2ed3b617b8 Jimmy Su 2022-01-12 830 return ret; 8c1d2ed3b617b8 Jimmy Su 2022-01-12 831 8c1d2ed3b617b8 Jimmy Su 2022-01-12 832 val = i2c_smbus_read_byte_data(client, OV08D10_REG_FLIP_OPT); 8c1d2ed3b617b8 Jimmy Su 2022-01-12 @833 if (val < 0) impossible 8c1d2ed3b617b8 Jimmy Su 2022-01-12 834 return val; 8c1d2ed3b617b8 Jimmy Su 2022-01-12 835 8c1d2ed3b617b8 Jimmy Su 2022-01-12 836 val = val | (ctrl_val & OV08D10_REG_FLIP_MASK); 8c1d2ed3b617b8 Jimmy Su 2022-01-12 837 8c1d2ed3b617b8 Jimmy Su 2022-01-12 838 ret = i2c_smbus_write_byte_data(client, OV08D10_REG_PAGE, 0x01); 8c1d2ed3b617b8 Jimmy Su 2022-01-12 839 if (ret < 0) 8c1d2ed3b617b8 Jimmy Su 2022-01-12 840 return ret; 8c1d2ed3b617b8 Jimmy Su 2022-01-12 841 8c1d2ed3b617b8 Jimmy Su 2022-01-12 842 ret = i2c_smbus_write_byte_data(client, OV08D10_REG_FLIP_OPT, val); 8c1d2ed3b617b8 Jimmy Su 2022-01-12 843 8c1d2ed3b617b8 Jimmy Su 2022-01-12 844 if (ret < 0) 8c1d2ed3b617b8 Jimmy Su 2022-01-12 845 return ret; 8c1d2ed3b617b8 Jimmy Su 2022-01-12 846 8c1d2ed3b617b8 Jimmy Su 2022-01-12 847 return i2c_smbus_write_byte_data(client, 8c1d2ed3b617b8 Jimmy Su 2022-01-12 848 OV08D10_REG_GLOBAL_EFFECTIVE, 0x01); 8c1d2ed3b617b8 Jimmy Su 2022-01-12 849 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org