Re: Re: Hotplug events during sleep transition

[Nigel Cunningham <ncunningham@cyclades.com>]

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Hi.

On Sat, 2005-12-24 at 08:31, Pavel Machek wrote:
> Hi!
> 
> > > > > Well, if you can find some elegant solution in the core, I think thats
> > > > > the best way.
> > > > > 
> > > > > You could set system_state to "suspending" or something like that, and
> > > > > just if() out notifications in that case.
> > > > 
> > > > How about simply adding a call to try_to_freeze() somewhere inside 
> > > > kernel/kmod.c:____call_usermodehelper()?  That ought to do pretty much 
> > > > what I want, in theory.  The hotplug processes would get frozen before 
> > > > /sbin/hotplug is exec'ed.
> > > 
> > > On modern distros, /sbin/hotplug is set to NULL, so this isn't an issue.
> > > We use netlink to send the data out, so this might not even be a problem
> > > anymore...
> > 
> > At resume time, prior to copying back the original kernel data, events
> > can and do occur.
> > 
> > FWIW, I've been using "if(freezer_is_on()) return 0" for a while in
> > call_usermodehelper_keys, to good effect.
> 
> Can we have a patch?

Well the version I'm using depends on my changes to the freezer, so I
can't give you one straight off, and I'm not likely to get around to it
today, so I was hoping someone else would run with the concept :)

Nigel


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