drivers/media/v4l2-core/v4l2-fwnode.c:928: undefined reference to `v4l2_async_subdev_notifier_register'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ce397d215ccd07b8ae3f71db689aedb85d56ab40
commit: 1fc3b37f34f69ee3fd61ca624fc005fb0bfe3984 media: v4l: cadence: Add Cadence MIPI-CSI2 RX driver
date:   5 weeks ago
config: x86_64-randconfig-s5-06180721 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 1fc3b37f34f69ee3fd61ca624fc005fb0bfe3984
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/media/v4l2-core/v4l2-fwnode.o: In function `v4l2_async_register_subdev_sensor_common':
>> drivers/media/v4l2-core/v4l2-fwnode.c:928: undefined reference to `v4l2_async_subdev_notifier_register'
>> drivers/media/v4l2-core/v4l2-fwnode.c:944: undefined reference to `v4l2_async_notifier_cleanup'
>> drivers/media/v4l2-core/v4l2-fwnode.c:932: undefined reference to `v4l2_async_register_subdev'
>> drivers/media/v4l2-core/v4l2-fwnode.c:941: undefined reference to `v4l2_async_notifier_unregister'
   drivers/media/platform/cadence/cdns-csi2rx.o: In function `csi2rx_remove':
>> drivers/media/platform/cadence/cdns-csi2rx.c:474: undefined reference to `v4l2_async_unregister_subdev'
   drivers/media/platform/cadence/cdns-csi2rx.o: In function `csi2rx_parse_dt':
>> drivers/media/platform/cadence/cdns-csi2rx.c:411: undefined reference to `v4l2_async_subdev_notifier_register'
   drivers/media/platform/cadence/cdns-csi2rx.o: In function `csi2rx_probe':
>> drivers/media/platform/cadence/cdns-csi2rx.c:438: undefined reference to `v4l2_subdev_init'
>> drivers/media/platform/cadence/cdns-csi2rx.c:454: undefined reference to `v4l2_async_register_subdev'

vim +928 drivers/media/v4l2-core/v4l2-fwnode.c

7a9ec808 Sakari Ailus 2017-09-06  910  
aef69d54 Sakari Ailus 2017-09-24  911  int v4l2_async_register_subdev_sensor_common(struct v4l2_subdev *sd)
aef69d54 Sakari Ailus 2017-09-24  912  {
aef69d54 Sakari Ailus 2017-09-24  913  	struct v4l2_async_notifier *notifier;
aef69d54 Sakari Ailus 2017-09-24  914  	int ret;
aef69d54 Sakari Ailus 2017-09-24  915  
aef69d54 Sakari Ailus 2017-09-24  916  	if (WARN_ON(!sd->dev))
aef69d54 Sakari Ailus 2017-09-24  917  		return -ENODEV;
aef69d54 Sakari Ailus 2017-09-24  918  
aef69d54 Sakari Ailus 2017-09-24  919  	notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
aef69d54 Sakari Ailus 2017-09-24  920  	if (!notifier)
aef69d54 Sakari Ailus 2017-09-24  921  		return -ENOMEM;
aef69d54 Sakari Ailus 2017-09-24  922  
aef69d54 Sakari Ailus 2017-09-24  923  	ret = v4l2_async_notifier_parse_fwnode_sensor_common(sd->dev,
aef69d54 Sakari Ailus 2017-09-24  924  							     notifier);
aef69d54 Sakari Ailus 2017-09-24  925  	if (ret < 0)
aef69d54 Sakari Ailus 2017-09-24  926  		goto out_cleanup;
aef69d54 Sakari Ailus 2017-09-24  927  
aef69d54 Sakari Ailus 2017-09-24 @928  	ret = v4l2_async_subdev_notifier_register(sd, notifier);
aef69d54 Sakari Ailus 2017-09-24  929  	if (ret < 0)
aef69d54 Sakari Ailus 2017-09-24  930  		goto out_cleanup;
aef69d54 Sakari Ailus 2017-09-24  931  
aef69d54 Sakari Ailus 2017-09-24 @932  	ret = v4l2_async_register_subdev(sd);
aef69d54 Sakari Ailus 2017-09-24  933  	if (ret < 0)
aef69d54 Sakari Ailus 2017-09-24  934  		goto out_unregister;
aef69d54 Sakari Ailus 2017-09-24  935  
aef69d54 Sakari Ailus 2017-09-24  936  	sd->subdev_notifier = notifier;
aef69d54 Sakari Ailus 2017-09-24  937  
aef69d54 Sakari Ailus 2017-09-24  938  	return 0;
aef69d54 Sakari Ailus 2017-09-24  939  
aef69d54 Sakari Ailus 2017-09-24  940  out_unregister:
aef69d54 Sakari Ailus 2017-09-24 @941  	v4l2_async_notifier_unregister(notifier);
aef69d54 Sakari Ailus 2017-09-24  942  
aef69d54 Sakari Ailus 2017-09-24  943  out_cleanup:
aef69d54 Sakari Ailus 2017-09-24 @944  	v4l2_async_notifier_cleanup(notifier);
aef69d54 Sakari Ailus 2017-09-24  945  	kfree(notifier);
aef69d54 Sakari Ailus 2017-09-24  946  
aef69d54 Sakari Ailus 2017-09-24  947  	return ret;
aef69d54 Sakari Ailus 2017-09-24  948  }
aef69d54 Sakari Ailus 2017-09-24  949  EXPORT_SYMBOL_GPL(v4l2_async_register_subdev_sensor_common);
aef69d54 Sakari Ailus 2017-09-24  950  

:::::: The code at line 928 was first introduced by commit
:::::: aef69d54755d45edefbf347a51efd1673d7daed9 media: v4l: fwnode: Add a convenience function for registering sensors

:::::: TO: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
:::::: CC: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>

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