[pvrusb2] pvrusb2 and suspend.

[xavier.gnata@free.fr]

Quoting Mike Isely <isely at isely.net>:

> On Thu, 3 Aug 2006, xavier.gnata at free.fr wrote:
>
> > Quoting roger <roger at eskimo.com>:
> >
> >> Although the driver, as module, can be easily put into
> >> "/etc/hibernate/blacklisted-modules" for automated unloading during
> >> suspend (and automated loading once returning from suspend),  I'm
> >> curious what would happen the driver is streaming on /dev/v4l/video0 and
> >> the machine is placed into suspend.
> >
> > Sure it can be but if you look at other in kernel v4l, as far as I can see,
> they
> > implement these suspend/resume function.
> > It is often not so difficult to stop the streaming and to reset the device
> at
> > resume time.  "/etc/hibernate/blacklisted-modules" is a blacklist :). It
> exists
> > only because drivers which are not suspend/resume compliant exist.
> > Mike has done a very nice job to avoid kernel oops when you unplug the
> device
> > during streaming. IMHO, it would be great not to have to add pvrusb2 in the
> > module blacklisted list (wich is know quite short)
> >
> > Trol : Even with ati non free driver, suspend to ram works well ;)
>
> There was a disccusion about this a while back.  I've forgotten the points
> that were made, but suffice to say that I actually do not understand
> suspend / resume well enough here to figure out what to do.  For example,
> what am I supposed to do if there are open file handles at the time the
> suspend takes place?  My foggy memory is telling me that there were some
> non-trivial issues standing in the way of this.
>
> I will try to look into this again.

Well, I think you can do the same job (for suspend) as when the cable is
unpluged during the streaming. In this case, we close all the stuff correctly
don't we?
Xavier