Re: [PATCH v9 2/3] media: rockchip: Add a driver for Rockchip's camera interface

[Christophe JAILLET]

Le 31/10/2023 à 10:33, Mehdi Djait a écrit :
> Hello Christophe,
>
> On Mon, Oct 30, 2023 at 01:47:17PM +0100, Christophe JAILLET wrote:
> > > +	/* Create & register platform subdev. */
> > > +	ret = cif_register_stream_vdev(cif_dev);
> > > +	if (ret < 0)
> > > +		goto err_unreg_media_dev;
> > > +
> > > +	ret = cif_subdev_notifier(cif_dev);
> > > +	if (ret < 0) {
> > > +		v4l2_err(&cif_dev->v4l2_dev,
> > > +			 "Failed to register subdev notifier(%d)\n", ret);
> > > +		cif_unregister_stream_vdev(cif_dev);
> > > +		goto err_unreg_media_dev;
> >
> > Should there be another label with cif_unregister_stream_vdev(cif_dev); if
> > an error occurs here?
> >
> > CJ
>
> cif_subdev_notifier() is the last function call in the probe with error
> handling. So it will undo the last successful register:
> cif_register_stream_vdev and use the goto to unregister the rest.

Ah, I didn't see the cif_unregister_stream_vdev() call here.
Sorry for the noise.

> I can add a label err_unreg_stream_vdev but it will be only used in the
> error handling of cif_subdev_notifier() and I don't see the benefit.

The main benefit is to be more consistent in the way the error path is 
written, and to be more future proof.

CJ
> --
> Kind Regards
> Mehdi Djait
>
> > > +	}
> > > +
> > > +	cif_set_default_format(cif_dev);
> > > +	pm_runtime_enable(&pdev->dev);
> > > +
> > > +	return 0;
> > > +
> > > +err_unreg_media_dev:
> > > +	media_device_unregister(&cif_dev->media_dev);
> > > +err_unreg_v4l2_dev:
> > > +	v4l2_device_unregister(&cif_dev->v4l2_dev);
> > > +	return ret;
> > > +}