Re: [PATCH v4 3/3] SPI: Add virtio SPI driver

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

Hi Haixu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on broonie-spi/for-next]
[also build test WARNING on linus/master v6.17-rc2 next-20250820]
[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/Haixu-Cui/virtio-Add-ID-for-virtio-SPI/20250820-165441
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
patch link:    https://lore.kernel.org/r/20250820084944.84505-4-quic_haixcui%40quicinc.com
patch subject: [PATCH v4 3/3] SPI: Add virtio SPI driver
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20250821/202508211051.cuOjaH00-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 93d24b6b7b148c47a2fa228a4ef31524fa1d9f3f)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250821/202508211051.cuOjaH00-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/202508211051.cuOjaH00-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/spi/spi-virtio.c:373:45: warning: cast from 'void (*)(struct virtio_device *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
     373 |         err = devm_add_action_or_reset(&vdev->dev, (void (*)(void *))virtio_spi_del_vq, vdev);
         |                                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/device/devres.h:166:34: note: expanded from macro 'devm_add_action_or_reset'
     166 |         __devm_add_action_or_reset(dev, action, data, #action)
         |                                         ^~~~~~
   1 warning generated.


vim +373 drivers/spi/spi-virtio.c

   333	
   334	static int virtio_spi_probe(struct virtio_device *vdev)
   335	{
   336		struct virtio_spi_priv *priv;
   337		struct spi_controller *ctrl;
   338		int err;
   339		u32 bus_num;
   340	
   341		ctrl = devm_spi_alloc_host(&vdev->dev, sizeof(*priv));
   342		if (!ctrl)
   343			return -ENOMEM;
   344	
   345		priv = spi_controller_get_devdata(ctrl);
   346		priv->vdev = vdev;
   347		vdev->priv = priv;
   348	
   349		device_set_node(&ctrl->dev, dev_fwnode(&vdev->dev));
   350	
   351		/* Setup ACPI node for controlled devices which will be probed through ACPI. */
   352		ACPI_COMPANION_SET(&vdev->dev, ACPI_COMPANION(vdev->dev.parent));
   353	
   354		dev_set_drvdata(&vdev->dev, ctrl);
   355	
   356		err = device_property_read_u32(&vdev->dev, "spi,bus-num", &bus_num);
   357		if (!err && bus_num <= S16_MAX)
   358			ctrl->bus_num = bus_num;
   359		else
   360			ctrl->bus_num = -1;
   361	
   362		virtio_spi_read_config(vdev);
   363	
   364		ctrl->transfer_one = virtio_spi_transfer_one;
   365	
   366		err = virtio_spi_find_vqs(priv);
   367		if (err) {
   368			dev_err_probe(&vdev->dev, err, "Cannot setup virtqueues\n");
   369			return err;
   370		}
   371	
   372		/* Register cleanup for virtqueues using devm */
 > 373		err = devm_add_action_or_reset(&vdev->dev, (void (*)(void *))virtio_spi_del_vq, vdev);
   374		if (err) {
   375			dev_err_probe(&vdev->dev, err, "Cannot register virtqueue cleanup\n");
   376			return err;
   377		}
   378	
   379		/* Use devm version to register controller */
   380		err = devm_spi_register_controller(&vdev->dev, ctrl);
   381		if (err) {
   382			dev_err_probe(&vdev->dev, err, "Cannot register controller\n");
   383			return err;
   384		}
   385	
   386		return 0;
   387	}
   388	

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