Re: Re: Hotplug events during sleep transition

Dmitry Torokhov
2005-12-22T18:20:31Z

On 12/22/05, Pavel Machek <pavel@suse.cz> wrote:
> Hi!
>
> > I recently worked on a patch to unbind USB drivers that don't have
> > suspend/resume methods, and then rebind them when the system comes back
> > up. There was an unexpected effect: In some cases the unbind or rebind
> > operations caused hotplug events, which started up new user processes at a
> > time when everything was supposed to be frozen. Obviously this is not a
> > good thing.
> >
> > Is there some other way these sorts of events can be handled? For
> > instance, can the hotplug system be smart enough to delay creating the new
> > processes? Or can they be created already in a frozen state?
>
> There were some problems with this already... but I do not recall what
> the solution was. lkml thread, IIRC. Were it PCMCIA cards or something
> like that?

It was serio layer. I just ensured that all hotplug events are
generated from serio thread thus making sure that we won't see them
during suspend.

--
Dmitry