tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.4.y
head:   de0cd3ea700d1e8ed76705d02e33b524cbb84cf3
commit: b7248281afb165ebd2f64dfd5ef4de3c5cc2a81f [3701/4798] media: vim2m: Register video device after setting up internals
config: x86_64-buildonly-randconfig-r002-20220815
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=b7248281afb165ebd2f64dfd5ef4de3c5cc2a81f
        git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
        git fetch --no-tags stable linux-5.4.y
        git checkout b7248281afb165ebd2f64dfd5ef4de3c5cc2a81f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/media/platform/

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

All warnings (new ones prefixed by >>):

   drivers/media/platform/vim2m.c: In function 'vim2m_probe':
>> drivers/media/platform/vim2m.c:1384:1: warning: label 'error_v4l2' defined but not used [-Wunused-label]
    1384 | error_v4l2:
         | ^~~~~~~~~~
   At top level:
   drivers/media/platform/vim2m.c:1309:38: warning: 'm2m_media_ops' defined but not used [-Wunused-const-variable=]
    1309 | static const struct media_device_ops m2m_media_ops = {
         |                                      ^~~~~~~~~~~~~


vim +/error_v4l2 +1384 drivers/media/platform/vim2m.c

  1313	
  1314	static int vim2m_probe(struct platform_device *pdev)
  1315	{
  1316		struct vim2m_dev *dev;
  1317		struct video_device *vfd;
  1318		int ret;
  1319	
  1320		dev = kzalloc(sizeof(*dev), GFP_KERNEL);
  1321		if (!dev)
  1322			return -ENOMEM;
  1323	
  1324		ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
  1325		if (ret)
  1326			goto error_free;
  1327	
  1328		atomic_set(&dev->num_inst, 0);
  1329		mutex_init(&dev->dev_mutex);
  1330	
  1331		dev->vfd = vim2m_videodev;
  1332		vfd = &dev->vfd;
  1333		vfd->lock = &dev->dev_mutex;
  1334		vfd->v4l2_dev = &dev->v4l2_dev;
  1335	
  1336		video_set_drvdata(vfd, dev);
  1337		v4l2_info(&dev->v4l2_dev,
  1338			  "Device registered as /dev/video%d\n", vfd->num);
  1339	
  1340		platform_set_drvdata(pdev, dev);
  1341	
  1342		dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
  1343		if (IS_ERR(dev->m2m_dev)) {
  1344			v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
  1345			ret = PTR_ERR(dev->m2m_dev);
  1346			dev->m2m_dev = NULL;
  1347			goto error_dev;
  1348		}
  1349	
  1350		ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
  1351		if (ret) {
  1352			v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
  1353			goto error_m2m;
  1354		}
  1355	
  1356	#ifdef CONFIG_MEDIA_CONTROLLER
  1357		dev->mdev.dev = &pdev->dev;
  1358		strscpy(dev->mdev.model, "vim2m", sizeof(dev->mdev.model));
  1359		strscpy(dev->mdev.bus_info, "platform:vim2m",
  1360			sizeof(dev->mdev.bus_info));
  1361		media_device_init(&dev->mdev);
  1362		dev->mdev.ops = &m2m_media_ops;
  1363		dev->v4l2_dev.mdev = &dev->mdev;
  1364	
  1365		ret = v4l2_m2m_register_media_controller(dev->m2m_dev, vfd,
  1366							 MEDIA_ENT_F_PROC_VIDEO_SCALER);
  1367		if (ret) {
  1368			v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem media controller\n");
  1369			goto error_v4l2;
  1370		}
  1371	
  1372		ret = media_device_register(&dev->mdev);
  1373		if (ret) {
  1374			v4l2_err(&dev->v4l2_dev, "Failed to register mem2mem media device\n");
  1375			goto error_m2m_mc;
  1376		}
  1377	#endif
  1378		return 0;
  1379	
  1380	#ifdef CONFIG_MEDIA_CONTROLLER
  1381	error_m2m_mc:
  1382		v4l2_m2m_unregister_media_controller(dev->m2m_dev);
  1383	#endif
> 1384	error_v4l2:
  1385		video_unregister_device(&dev->vfd);
  1386		/* vim2m_device_release called by video_unregister_device to release various objects */
  1387		return ret;
  1388	error_m2m:
  1389		v4l2_m2m_release(dev->m2m_dev);
  1390	error_dev:
  1391		v4l2_device_unregister(&dev->v4l2_dev);
  1392	error_free:
  1393		kfree(dev);
  1394	
  1395		return ret;
  1396	}
  1397	

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