Re: [PATCH v2 1/2] iio: adc: vf610_adc: use devm_* and dev_err_probe() to simple code

[kernel test robot]

Hi Frank,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on next-20241106]
[cannot apply to linus/master v6.12-rc6]
[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/Frank-Li/iio-adc-vf610_adc-limit-i-MX6SX-s-channel-number-to-4/20241106-001101
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link:    https://lore.kernel.org/r/20241105160822.2761261-1-Frank.Li%40nxp.com
patch subject: [PATCH v2 1/2] iio: adc: vf610_adc: use devm_* and dev_err_probe() to simple code
config: i386-randconfig-141-20241107 (https://download.01.org/0day-ci/archive/20241107/202411070633.NIrO7Ert-lkp@xxxxxxxxx/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)

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/202411070633.NIrO7Ert-lkp@xxxxxxxxx/

smatch warnings:
drivers/iio/adc/vf610_adc.c:857 vf610_adc_probe() warn: unsigned 'info->vref_uv' is never less than zero.

vim +857 drivers/iio/adc/vf610_adc.c

   816	
   817	static int vf610_adc_probe(struct platform_device *pdev)
   818	{
   819		struct device *dev = &pdev->dev;
   820		struct vf610_adc *info;
   821		struct iio_dev *indio_dev;
   822		int irq;
   823		int ret;
   824	
   825		indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct vf610_adc));
   826		if (!indio_dev)
   827			return dev_err_probe(&pdev->dev, -ENOMEM, "Failed allocating iio device\n");
   828	
   829		info = iio_priv(indio_dev);
   830		info->dev = &pdev->dev;
   831	
   832		info->regs = devm_platform_ioremap_resource(pdev, 0);
   833		if (IS_ERR(info->regs))
   834			return PTR_ERR(info->regs);
   835	
   836		irq = platform_get_irq(pdev, 0);
   837		if (irq < 0)
   838			return irq;
   839	
   840		ret = devm_request_irq(info->dev, irq,
   841					vf610_adc_isr, 0,
   842					dev_name(&pdev->dev), indio_dev);
   843		if (ret < 0)
   844			dev_err_probe(&pdev->dev, ret, "failed requesting irq, irq = %d\n", irq);
   845	
   846		info->clk = devm_clk_get_enabled(&pdev->dev, "adc");
   847		if (IS_ERR(info->clk))
   848			return dev_err_probe(&pdev->dev, PTR_ERR(info->clk),
   849					     "failed getting clock, err = %ld\n",
   850					     PTR_ERR(info->clk));
   851	
   852		info->vref = devm_regulator_get(&pdev->dev, "vref");
   853		if (IS_ERR(info->vref))
   854			return PTR_ERR(info->vref);
   855	
   856		info->vref_uv = devm_regulator_get_enable_read_voltage(&pdev->dev, "vref");
 > 857		if (info->vref_uv < 0)
   858			return info->vref_uv;
   859	
   860		device_property_read_u32_array(dev, "fsl,adck-max-frequency", info->max_adck_rate, 3);
   861	
   862		info->adc_feature.default_sample_time = DEFAULT_SAMPLE_TIME;
   863		device_property_read_u32(dev, "min-sample-time", &info->adc_feature.default_sample_time);
   864	
   865		platform_set_drvdata(pdev, indio_dev);
   866	
   867		init_completion(&info->completion);
   868	
   869		indio_dev->name = dev_name(&pdev->dev);
   870		indio_dev->info = &vf610_adc_iio_info;
   871		indio_dev->modes = INDIO_DIRECT_MODE;
   872		indio_dev->channels = vf610_adc_iio_channels;
   873		indio_dev->num_channels = ARRAY_SIZE(vf610_adc_iio_channels);
   874	
   875		vf610_adc_cfg_init(info);
   876		vf610_adc_hw_init(info);
   877	
   878		ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev, &iio_pollfunc_store_time,
   879						      NULL, &iio_triggered_buffer_setup_ops);
   880		if (ret < 0)
   881			return dev_err_probe(&pdev->dev, ret, "Couldn't initialise the buffer\n");
   882	
   883		mutex_init(&info->lock);
   884	
   885		ret = devm_iio_device_register(&pdev->dev, indio_dev);
   886		if (ret)
   887			return dev_err_probe(&pdev->dev, ret, "Couldn't register the device.\n");
   888	
   889		return 0;
   890	}
   891	

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