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SubjectRe: [RFC PATCH v2 1/3] PM / Core: suspend_again callback for device PM.
On Tue, Apr 26, 2011 at 10:38:53PM +0200, Pavel Machek wrote:
> Hi!
>
> > > To conclude, I'm not sure about the approach. In particular, I'm not sure
> > > if the benefit is worth the effort and the resulting complications (ie. the
> > > possibility of having to deal with wakeup signals not requested by user
> > > space) seem to be a bit too far reaching.
> > >
> > > Greg, what do you think?
> >
> > I agree with you in that I don't think that this type of feature is
> > valid at the moment.
>
> Our current "solution" is low level suspend code on Zaurus directly
> looking at charger state and doing the "wakeup or not" decision by hand.
>
> > I don't understand why our current situation doesn't work, what are we
> > lacking that is needed for these systems that we have not seen
> > before?
>
> It works, but it is ugly; and it seems samsung now needs similar
> hacks.
>
> > What is the root problem that this is trying to solve?
>
> It is trying to fix machines that need to run periodic kernel tasks
> even when user asked them to sleep. Zaurus needs to periodicaly wake
> up to be able to charge battery in s2ram state, for example.

That sounds like a bug in userspace you are trying to work around. Why
not solve it there first?

thanks,

greg k-h


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