linux-kernel - Re: [PATCH v2 1/1] i2c: scmi: Replace open coded device_get_match

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Date:   Fri, 8 Jul 2022 19:50:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org,
        Wolfram Sang <wsa-dev@...g-engineering.com>
Subject: Re: [PATCH v2 1/1] i2c: scmi: Replace open coded
 device_get_match_data()

Hi Andy,

I love your patch! Perhaps something to improve:

[auto build test WARNING on wsa/i2c/for-next]
[also build test WARNING on linus/master v5.19-rc5 next-20220708]
[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/Andy-Shevchenko/i2c-scmi-Replace-open-coded-device_get_match_data/20220708-180449
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
config: i386-randconfig-a001 (https://download.01.org/0day-ci/archive/20220708/202207081957.tSlBfZYh-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/c111b5704bd215394f238fa88925d6832cf2562c
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Andy-Shevchenko/i2c-scmi-Replace-open-coded-device_get_match_data/20220708-180449
        git checkout c111b5704bd215394f238fa88925d6832cf2562c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/i2c/busses/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/i2c/busses/i2c-scmi.c: In function 'acpi_smbus_cmi_add':
>> drivers/i2c/busses/i2c-scmi.c:372:28: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     372 |         smbus_cmi->methods = device_get_match_data(&device->dev);
         |                            ^
>> drivers/i2c/busses/i2c-scmi.c:364:38: warning: unused variable 'id' [-Wunused-variable]
     364 |         const struct acpi_device_id *id;
         |                                      ^~


vim +/const +372 drivers/i2c/busses/i2c-scmi.c

   360	
   361	static int acpi_smbus_cmi_add(struct acpi_device *device)
   362	{
   363		struct acpi_smbus_cmi *smbus_cmi;
 > 364		const struct acpi_device_id *id;
   365		int ret;
   366	
   367		smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL);
   368		if (!smbus_cmi)
   369			return -ENOMEM;
   370	
   371		smbus_cmi->handle = device->handle;
 > 372		smbus_cmi->methods = device_get_match_data(&device->dev);
   373		strcpy(acpi_device_name(device), ACPI_SMBUS_HC_DEVICE_NAME);
   374		strcpy(acpi_device_class(device), ACPI_SMBUS_HC_CLASS);
   375		device->driver_data = smbus_cmi;
   376		smbus_cmi->cap_info = 0;
   377		smbus_cmi->cap_read = 0;
   378		smbus_cmi->cap_write = 0;
   379	
   380		acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1,
   381				    acpi_smbus_cmi_query_methods, NULL, smbus_cmi, NULL);
   382	
   383		if (smbus_cmi->cap_info == 0) {
   384			ret = -ENODEV;
   385			goto err;
   386		}
   387	
   388		snprintf(smbus_cmi->adapter.name, sizeof(smbus_cmi->adapter.name),
   389			"SMBus CMI adapter %s",
   390			acpi_device_name(device));
   391		smbus_cmi->adapter.owner = THIS_MODULE;
   392		smbus_cmi->adapter.algo = &acpi_smbus_cmi_algorithm;
   393		smbus_cmi->adapter.algo_data = smbus_cmi;
   394		smbus_cmi->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
   395		smbus_cmi->adapter.dev.parent = &device->dev;
   396	
   397		ret = i2c_add_adapter(&smbus_cmi->adapter);
   398		if (ret) {
   399			dev_err(&device->dev, "Couldn't register adapter!\n");
   400			goto err;
   401		}
   402	
   403		return 0;
   404	
   405	err:
   406		kfree(smbus_cmi);
   407		device->driver_data = NULL;
   408		return ret;
   409	}
   410	

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