Hi Shunqian, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linuxtv-media/master] [also build test WARNING on v4.15-rc5 next-20171222] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Shunqian-Zheng/media-ov5695-add-support-for-OV5695-sensor/20171226-110821 base: git://linuxtv.org/media_tree.git master reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__ sparse warnings: (new ones prefixed by >>) vim +248 drivers/media/i2c/ov2685.c 232 233 /* Write registers up to 4 at a time */ 234 static int ov2685_write_reg(struct i2c_client *client, u16 reg, 235 unsigned int len, u32 val) 236 { 237 int buf_i; 238 int val_i; 239 u8 buf[6]; 240 u8 *val_p; 241 242 if (len > 4) 243 return -EINVAL; 244 245 buf[0] = reg >> 8; 246 buf[1] = reg & 0xff; 247 > 248 val = cpu_to_be32(val); 249 val_p = (u8 *)&val; 250 buf_i = 2; 251 val_i = 4 - len; 252 253 while (val_i < 4) 254 buf[buf_i++] = val_p[val_i++]; 255 256 if (i2c_master_send(client, buf, len + 2) != len + 2) 257 return -EIO; 258 259 return 0; 260 } 261 262 static int ov2685_write_array(struct i2c_client *client, 263 const struct regval *regs) 264 { 265 int i, ret = 0; 266 267 for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) 268 ret = ov2685_write_reg(client, regs[i].addr, 269 OV2685_REG_VALUE_08BIT, regs[i].val); 270 271 return ret; 272 } 273 274 /* Read registers up to 4 at a time */ 275 static int ov2685_read_reg(struct i2c_client *client, u16 reg, 276 unsigned int len, u32 *val) 277 { 278 struct i2c_msg msgs[2]; 279 u8 *data_be_p; 280 u32 data_be = 0; > 281 u16 reg_addr_be = cpu_to_be16(reg); 282 int ret; 283 284 if (len > 4) 285 return -EINVAL; 286 287 data_be_p = (u8 *)&data_be; 288 /* Write register address */ 289 msgs[0].addr = client->addr; 290 msgs[0].flags = 0; 291 msgs[0].len = 2; 292 msgs[0].buf = (u8 *)®_addr_be; 293 294 /* Read data from register */ 295 msgs[1].addr = client->addr; 296 msgs[1].flags = I2C_M_RD; 297 msgs[1].len = len; 298 msgs[1].buf = &data_be_p[4 - len]; 299 300 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 301 if (ret != ARRAY_SIZE(msgs)) 302 return -EIO; 303 > 304 *val = be32_to_cpu(data_be); 305 306 return 0; 307 } 308 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
