Re: [PULL] http://www.linuxtv.org/hg/~hverkuil/v4l-dvb-videodev2

[Laurent Pinchart <laurent.pinchart@xxxxxxxxx>]

Hi Mauro,

On Tuesday 22 July 2008, Mauro Carvalho Chehab wrote:
> On Tue, 22 Jul 2008, Laurent Pinchart wrote:
> >> Just for you all to know (I'm c/c Laurent - I suspect he is not
> >> currently subscribed at this ML, and there are a few uvc patches still
> >> pending),
> >
> > Thanks. Where is the subscription form ?
>
> It is at the mailman interface, at www.linuxtv.org. It is a good idea to
> subscribe to this list. People that have their trees at linuxtv are
> automatically added by the script we use to crete they an account.

I can't see any 'v4l-dvb-maintainer' list in 
http://www.linuxtv.org/cgi-bin/mailman/listinfo

> > Agreed. While you're at it, can you make video_ioctl2() use
> > video_usercopy() ? The two functions are nearly identical.
>
> video_usercopy is the legacy method. No new drivers are written using it.
>
> It should be there for some time, since there are still several drivers
> using it, but the idea is not to use it on new drivers, and to depreciate
> it in the future. While there's no hush for such change on legacy
> drivers[1], in fact, almost all drivers actively maintained were
> already migrated to video_ioctl2.
>
> So, it doesn't seem interesting to invest on it. Also, being a separate
> function will make easier for checkpatch to warn for patches touching on
> it, when we decide to add it at the depreciated list.

The uvcvideo driver needs video_usercopy. Until we find a solution for the 
uvcvideo driver, video_usercopy shouldn't be marked as deprecated. As such it 
should currently be used in video_ioctl2 instead of duplicating the whole 
function.

> [1] The top priority for the legacy drivers is to convert they to V4L2 or
> to replace they by another driver that is V4L2 compliant. One good project
> in this area would be to have gpca absorving the legacy V4L1 webcam
> drivers.

Best regards,

Laurent Pinchart

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