Re: [PATCH v9 2/4] leds: add TI/National Semiconductor LP5812 LED Driver

[kernel test robot <lkp@intel.com>]

Hi Nam,

kernel test robot noticed the following build warnings:

[auto build test WARNING on f09079bd04a924c72d555cd97942d5f8d7eca98c]

url:    https://github.com/intel-lab-lkp/linux/commits/Nam-Tran/dt-bindings-leds-add-TI-National-Semiconductor-LP5812-LED-Driver/20250611-100314
base:   f09079bd04a924c72d555cd97942d5f8d7eca98c
patch link:    https://lore.kernel.org/r/20250610174319.183375-4-trannamatk%40gmail.com
patch subject: [PATCH v9 2/4] leds: add TI/National Semiconductor LP5812 LED Driver
config: x86_64-randconfig-002-20250617 (https://download.01.org/0day-ci/archive/20250617/202506170238.VtqmOKaK-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250617/202506170238.VtqmOKaK-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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506170238.VtqmOKaK-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/leds/rgb/leds-lp5812.c: In function 'lp5812_init_led.isra':
>> drivers/leds/rgb/leds-lp5812.c:1585:57: warning: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size between 5 and 24 [-Wformat-truncation=]
    1585 |                 snprintf(name, sizeof(name), "%s:channel%d",
         |                                                         ^~
   drivers/leds/rgb/leds-lp5812.c:1585:46: note: directive argument in the range [0, 2147483647]
    1585 |                 snprintf(name, sizeof(name), "%s:channel%d",
         |                                              ^~~~~~~~~~~~~~
   drivers/leds/rgb/leds-lp5812.c:1585:17: note: 'snprintf' output between 10 and 38 bytes into a destination of size 32
    1585 |                 snprintf(name, sizeof(name), "%s:channel%d",
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1586 |                          pdata->label ? : chip->i2c_cl->name, chan);
         |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +1585 drivers/leds/rgb/leds-lp5812.c

  1572	
  1573	static int lp5812_init_led(struct lp5812_led *led, struct lp5812_chip *chip, int chan)
  1574	{
  1575		struct lp5812_data *pdata = chip->pdata;
  1576		struct device *dev = &chip->i2c_cl->dev;
  1577		struct mc_subled *mc_led_info;
  1578		struct led_classdev *led_cdev;
  1579		char name[32];
  1580		int i, ret = 0;
  1581	
  1582		if (pdata->led_config[chan].name) {
  1583			led->cdev.name = pdata->led_config[chan].name;
  1584		} else {
> 1585			snprintf(name, sizeof(name), "%s:channel%d",
  1586				 pdata->label ? : chip->i2c_cl->name, chan);
  1587			led->cdev.name = name;
  1588		}
  1589	
  1590		if (pdata->led_config[chan].is_sc_led == 0) {
  1591			mc_led_info = devm_kcalloc(dev,
  1592						   pdata->led_config[chan].num_colors,
  1593						   sizeof(*mc_led_info), GFP_KERNEL);
  1594			if (!mc_led_info)
  1595				return -ENOMEM;
  1596	
  1597			led_cdev = &led->mc_cdev.led_cdev;
  1598			led_cdev->name = led->cdev.name;
  1599			led_cdev->brightness_set_blocking = lp5812_set_mc_brightness;
  1600			led->mc_cdev.num_colors = pdata->led_config[chan].num_colors;
  1601			for (i = 0; i < led->mc_cdev.num_colors; i++) {
  1602				mc_led_info[i].color_index =
  1603					pdata->led_config[chan].color_id[i];
  1604				mc_led_info[i].channel =
  1605						pdata->led_config[chan].led_id[i];
  1606			}
  1607	
  1608			led->mc_cdev.subled_info = mc_led_info;
  1609		} else {
  1610			led->cdev.brightness_set_blocking = lp5812_set_brightness;
  1611		}
  1612	
  1613		led->cdev.groups = lp5812_led_groups;
  1614		led->chan_nr = chan;
  1615	
  1616		if (pdata->led_config[chan].is_sc_led) {
  1617			ret = devm_led_classdev_register(dev, &led->cdev);
  1618			if (ret == 0) {
  1619				led->cdev.dev->platform_data = devm_kstrdup(dev, LP5812_SC_LED, GFP_KERNEL);
  1620				if (!led->cdev.dev->platform_data)
  1621					return -ENOMEM;
  1622			}
  1623		} else {
  1624			ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev);
  1625			if (ret == 0) {
  1626				led->mc_cdev.led_cdev.dev->platform_data =
  1627					devm_kstrdup(dev, LP5812_MC_LED, GFP_KERNEL);
  1628				if (!led->mc_cdev.led_cdev.dev->platform_data)
  1629					return -ENOMEM;
  1630	
  1631				ret = sysfs_create_groups(&led->mc_cdev.led_cdev.dev->kobj,
  1632							  lp5812_led_groups);
  1633				if (ret)
  1634					dev_err(dev, "sysfs_create_groups failed\n");
  1635			}
  1636		}
  1637	
  1638		if (ret) {
  1639			dev_err(dev, "led register err: %d\n", ret);
  1640			return ret;
  1641		}
  1642	
  1643		return 0;
  1644	}
  1645	

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