Re: [PATCH v3 3/3] iio: chemical: add support for Aosong AGS02MA

[kernel test robot]

Hi Anshul,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on linus/master v6.7-rc2 next-20231124]
[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/Anshul-Dalal/dt-bindings-iio-chemical-add-aosong-ags02ma/20231121-180435
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link:    https://lore.kernel.org/r/20231121095800.2180870-3-anshulusr%40gmail.com
patch subject: [PATCH v3 3/3] iio: chemical: add support for Aosong AGS02MA
config: arm-randconfig-r081-20231123 (https://download.01.org/0day-ci/archive/20231125/202311251636.m0yt3fIb-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231125/202311251636.m0yt3fIb-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311251636.m0yt3fIb-lkp@xxxxxxxxx/

New smatch warnings:
drivers/iio/chemical/ags02ma.c:53 ags02ma_register_read() warn: unsigned 'ret' is never less than zero.

Old smatch warnings:
drivers/iio/chemical/ags02ma.c:63 ags02ma_register_read() warn: unsigned 'ret' is never less than zero.

vim +/ret +53 drivers/iio/chemical/ags02ma.c

    45	
    46	static u32 ags02ma_register_read(struct i2c_client *client, u8 reg, u16 delay)
    47	{
    48		u32 ret;
    49		u8 crc;
    50		struct ags02ma_reading read_buffer;
    51	
    52		ret = i2c_master_send(client, &reg, sizeof(reg));
  > 53		if (ret < 0) {
    54			dev_err(&client->dev,
    55				"Failed to send data to register 0x%x: %d", reg, ret);
    56			return ret;
    57		}
    58	
    59		/* Processing Delay, Check Table 7.7 in the datasheet */
    60		msleep_interruptible(delay);
    61	
    62		ret = i2c_master_recv(client, (u8 *)&read_buffer, sizeof(read_buffer));
    63		if (ret < 0) {
    64			dev_err(&client->dev,
    65				"Failed to receive from register 0x%x: %d", reg, ret);
    66			return ret;
    67		}
    68		ret = be32_to_cpu(read_buffer.data);
    69	
    70		crc = crc8(ags02ma_crc8_table, (u8 *)&read_buffer.data,
    71			   sizeof(read_buffer.data), AGS02MA_CRC8_INIT);
    72		if (crc != read_buffer.crc) {
    73			dev_err(&client->dev, "CRC error\n");
    74			return -EIO;
    75		}
    76	
    77		return ret;
    78	}
    79	

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