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Date:   Thu, 29 Jun 2023 09:53:16 +0300
From:   Dan Carpenter <dan.carpenter@linaro.org>
To:     oe-kbuild@lists.linux.dev, Eddie James <eajames@linux.ibm.com>,
        linux-hwmon@vger.kernel.org
Cc:     lkp@intel.com, oe-kbuild-all@lists.linux.dev,
        linux-kernel@vger.kernel.org, linux@roeck-us.net,
        jdelvare@suse.com, lakshmiy@us.ibm.com,
        Eddie James <eajames@linux.ibm.com>
Subject: Re: [PATCH] hwmon: (pmbus/acbel-fsg032) Add firmware version debugfs
 attribute
Message-ID: <b12935a2-a8b7-4d70-8c7d-6fd1e92037c2@kadam.mountain>
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In-Reply-To: <20230627184027.16343-1-eajames@linux.ibm.com>
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Hi Eddie,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Eddie-James/hwmon-pmbus-acbel-fsg032-Add-firmware-version-debugfs-attribute/20230628-030615
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
patch link:    https://lore.kernel.org/r/20230627184027.16343-1-eajames%40linux.ibm.com
patch subject: [PATCH] hwmon: (pmbus/acbel-fsg032) Add firmware version debugfs attribute
config: x86_64-randconfig-m001-20230627 (https://download.01.org/0day-ci/archive/20230628/202306281205.NFXmu7xb-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230628/202306281205.NFXmu7xb-lkp@intel.com/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@intel.com>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202306281205.NFXmu7xb-lkp@intel.com/

smatch warnings:
drivers/hwmon/pmbus/acbel-fsg032.c:36 acbel_fsg032_debugfs_read() warn: argument 4 to %02X specifier has type 'char'

vim +/char +36 drivers/hwmon/pmbus/acbel-fsg032.c

d2c6444389b625 Eddie James 2023-06-27  17  static ssize_t acbel_fsg032_debugfs_read(struct file *file, char __user *buf, size_t count,
d2c6444389b625 Eddie James 2023-06-27  18  					 loff_t *ppos)
d2c6444389b625 Eddie James 2023-06-27  19  {
d2c6444389b625 Eddie James 2023-06-27  20  	struct i2c_client *client = file->private_data;
d2c6444389b625 Eddie James 2023-06-27  21  	char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };

data should probably be a u8.

d2c6444389b625 Eddie James 2023-06-27  22  	char out[8];
d2c6444389b625 Eddie James 2023-06-27  23  	int rc;
d2c6444389b625 Eddie James 2023-06-27  24  	int i;
d2c6444389b625 Eddie James 2023-06-27  25  
d2c6444389b625 Eddie James 2023-06-27  26  	rc = pmbus_lock_interruptible(client);
d2c6444389b625 Eddie James 2023-06-27  27  	if (rc)
d2c6444389b625 Eddie James 2023-06-27  28  		return rc;
d2c6444389b625 Eddie James 2023-06-27  29  
d2c6444389b625 Eddie James 2023-06-27  30  	rc = i2c_smbus_read_block_data(client, ACBEL_MFR_FW_REVISION, data);
d2c6444389b625 Eddie James 2023-06-27  31  	pmbus_unlock(client);
d2c6444389b625 Eddie James 2023-06-27  32  	if (rc < 0)
d2c6444389b625 Eddie James 2023-06-27  33  		return rc;
d2c6444389b625 Eddie James 2023-06-27  34  
d2c6444389b625 Eddie James 2023-06-27  35  	for (i = 0; i < rc && i < 3; ++i)
d2c6444389b625 Eddie James 2023-06-27 @36  		snprintf(&out[i * 2], 3, "%02X", data[i]);

If data[i] is negative this will print FFFFFFF1 etc.  (This is an x86
config...  Did we ever merge that patch to make char signed by default?)

d2c6444389b625 Eddie James 2023-06-27  37  
d2c6444389b625 Eddie James 2023-06-27  38  	rc = i * 2;
d2c6444389b625 Eddie James 2023-06-27  39  	out[rc++] = '\n';
d2c6444389b625 Eddie James 2023-06-27  40  	out[rc++] = 0;
d2c6444389b625 Eddie James 2023-06-27  41  	return simple_read_from_buffer(buf, count, ppos, out, rc);
d2c6444389b625 Eddie James 2023-06-27  42  }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki