Re: [linux-pm] Re: swsusp 'disk' fails in bk-current - intel_agp at fault?

[Nigel Cunningham <ncunningham@cyclades.com>]

Hi.

On Fri, 2005-04-01 at 08:18, Pavel Machek wrote:
> Hi!
> 
> > > > Ok, what do you think about this one?
> > > >
> > > > ===================================================================
> > > >
> > > > swsusp: disable usermodehelper after generating memory snapshot and
> > > >         before resuming devices, so when device fails to resume we
> > > >         won't try to call hotplug - userspace stopped anyway.
> > > 
> > > Hm, shouldn't we disable it before we start to freeze processes? We don't
> > > want any more processes trying to start up after we've taken care of
> > > them..
> > > 
> > 
> > Can't a device be removed (for any reason) _while_ we are freezing
> > processes? I think freeszing code will properly deal with it... What
> > about suspend semantics - if suspend fails do we say the device should
> > be operational or the system should attempt to re-initialize? I.e. we
> > are not doing suspend after all - can we still drop messages on the
> > floor? After all, we still have ability to run coldplug after failed
> > suspend.
> 
> I believe we should freeze hotplug before processes. Dropping messages
> on the floor should not be a problem, we should just call coldplug
> after failed suspend.

How will you know which devices to call coldplug for, post resume? (Or
does it figure that out itself somehow?)

Regards,

Nigel
-- 
Nigel Cunningham
Software Engineer, Canberra, Australia
http://www.cyclades.com
Bus: +61 (2) 6291 9554; Hme: +61 (2) 6292 8028;  Mob: +61 (417) 100 574

Maintainer of Suspend2 Kernel Patches http://suspend2.net