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 +713 drivers/media/i2c/ov5695.c 697 698 /* Write registers up to 4 at a time */ 699 static int ov5695_write_reg(struct i2c_client *client, u16 reg, 700 unsigned int len, u32 val) 701 { 702 int buf_i; 703 int val_i; 704 u8 buf[6]; 705 u8 *val_p; 706 707 if (len > 4) 708 return -EINVAL; 709 710 buf[0] = reg >> 8; 711 buf[1] = reg & 0xff; 712 > 713 val = cpu_to_be32(val); 714 val_p = (u8 *)&val; 715 buf_i = 2; 716 val_i = 4 - len; 717 718 while (val_i < 4) 719 buf[buf_i++] = val_p[val_i++]; 720 721 if (i2c_master_send(client, buf, len + 2) != len + 2) 722 return -EIO; 723 724 return 0; 725 } 726 727 static int ov5695_write_array(struct i2c_client *client, 728 const struct regval *regs) 729 { 730 int i, ret = 0; 731 732 for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) 733 ret = ov5695_write_reg(client, regs[i].addr, 734 OV5695_REG_VALUE_08BIT, regs[i].val); 735 736 return ret; 737 } 738 739 /* Read registers up to 4 at a time */ 740 static int ov5695_read_reg(struct i2c_client *client, u16 reg, unsigned int len, 741 u32 *val) 742 { 743 struct i2c_msg msgs[2]; 744 u8 *data_be_p; 745 u32 data_be = 0; > 746 u16 reg_addr_be = cpu_to_be16(reg); 747 int ret; 748 749 if (len > 4) 750 return -EINVAL; 751 752 data_be_p = (u8 *)&data_be; 753 /* Write register address */ 754 msgs[0].addr = client->addr; 755 msgs[0].flags = 0; 756 msgs[0].len = 2; 757 msgs[0].buf = (u8 *)®_addr_be; 758 759 /* Read data from register */ 760 msgs[1].addr = client->addr; 761 msgs[1].flags = I2C_M_RD; 762 msgs[1].len = len; 763 msgs[1].buf = &data_be_p[4 - len]; 764 765 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 766 if (ret != ARRAY_SIZE(msgs)) 767 return -EIO; 768 > 769 *val = be32_to_cpu(data_be); 770 771 return 0; 772 } 773 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
