Re: [suspend/resume] Re: userspace notification from module

From: Pavel Machek
Date: Tue Jan 19 2010 - 00:16:08 EST

On Sun 2010-01-17 13:26:18, Russell King - ARM Linux wrote:
> On Sun, Jan 17, 2010 at 02:07:39PM +0100, Pavel Machek wrote:
> > AFAICT following message would be nice.
> >
> > 1) battery is critical, userspace please do something
> >
> > On zaurus and similar, you could add
> >
> > 2) oh and btw we had power failure so we suspended (or maybe -- so
> > hardware suspended itself -- rmk's examples and old apm systems); we
> > are now back and running
> >
> > notification... but... ideally those power failures should never
> > happen anyway, so... having this notification is in no way neccessary.
> There's another consideration here: the more complex the emergency
> procedure, the higher the chance of _something_ causing it to fail,
> and if it does fail, the result is data loss.

That's why I propose to only send notification after we resume from
emergency suspend :-).

> In a properly running system, this isn't something that's going to
> get a lot of testing, so there's a higher chance that there will be
> bugs, so the simpler the solution, the better.

Unfortunately, with old battery in zaurus, I tested it rather a lot. I
have new one now, but I can still use old one for testing.
(cesky, pictures)
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