Re: [PATCH v5 7/8] iio: adc: ad7606: Add iio-backend support

[kernel test robot]

Hi Guillaume,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 465644ac29536d10178b5ca4684d0b84765b9fa4]

url:    https://github.com/intel-lab-lkp/linux/commits/Guillaume-Stols/dt-bindings-iio-adc-ad7606-Remove-spi-cpha-from-required/20241015-215831
base:   465644ac29536d10178b5ca4684d0b84765b9fa4
patch link:    https://lore.kernel.org/r/20241015-ad7606_add_iio_backend_support-v5-7-654faf1ae08c%40baylibre.com
patch subject: [PATCH v5 7/8] iio: adc: ad7606: Add iio-backend support
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241019/202410190802.CLaySBOq-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241019/202410190802.CLaySBOq-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/202410190802.CLaySBOq-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/iio/adc/ad7606_par.c:173:22: warning: unused variable 'back' [-Wunused-variable]
     173 |         struct iio_backend *back;
         |                             ^~~~
   1 warning generated.


vim +/back +173 drivers/iio/adc/ad7606_par.c

   164	
   165	static int ad7606_par_probe(struct platform_device *pdev)
   166	{
   167		const struct ad7606_chip_info *chip_info;
   168		const struct platform_device_id *id;
   169		struct resource *res;
   170		void __iomem *addr;
   171		resource_size_t remap_size;
   172		int irq;
 > 173		struct iio_backend *back;
   174	
   175		/*
   176		 * If a firmware node is available (ACPI or DT), platform_device_id is null
   177		 * and we must use get_match_data.
   178		 */
   179		if (dev_fwnode(&pdev->dev)) {
   180			chip_info = device_get_match_data(&pdev->dev);
   181			if (device_property_present(&pdev->dev, "io-backends"))
   182				/*
   183				 * If a backend is available ,call the core probe with backend
   184				 * bops, otherwise use the former bops.
   185				 */
   186				return ad7606_probe(&pdev->dev, 0, NULL,
   187						    chip_info,
   188						    &ad7606_bi_bops);
   189		} else {
   190			id = platform_get_device_id(pdev);
   191			chip_info = (const struct ad7606_chip_info *)id->driver_data;
   192		}
   193	
   194		irq = platform_get_irq(pdev, 0);
   195		if (irq < 0)
   196			return irq;
   197	
   198		addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
   199		if (IS_ERR(addr))
   200			return PTR_ERR(addr);
   201	
   202		remap_size = resource_size(res);
   203	
   204		return ad7606_probe(&pdev->dev, irq, addr, chip_info,
   205				    remap_size > 1 ? &ad7606_par16_bops :
   206				    &ad7606_par8_bops);
   207	}
   208	

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