On Monday, November 22, 2010 00:35:54 Laurent Pinchart wrote:
> Hi Jonathan,
>
> I forgot to answer one of your comments.
>
> On Wednesday 17 November 2010 01:31:15 Jonathan Corbet wrote:
>
> [snip]
>
> > > +static unsigned int media_poll(struct file *filp,
> > > + struct poll_table_struct *poll)
> > > +{
> > > + struct media_devnode *mdev = media_devnode_data(filp);
> > > +
> > > + if (!mdev->fops->poll || !media_devnode_is_registered(mdev))
> > > + return DEFAULT_POLLMASK;
> > > + return mdev->fops->poll(filp, poll);
> > > +}
> >
> > If it's not registered, I would expect poll() to return an error.
>
> Agreed. I'll return POLLERR | POLLHUP in that case. Is that fine with you ?
When I looked at this for the core code I decided to just return POLLERR. That
seemed to be what the majority of other usb drivers do. ALSA returns
POLLERR | POLLNVAL, by the way, which I think is a poor choice.
This doesn't really seem to be standardized :-(
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by Cisco
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