Date: Tue, 19 Jan 2010 06:15:38 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Andy Walls <awalls@radix.net>,
       Eric Miao <eric.y.miao@gmail.com>, omegamoon@gmail.com,
       dbaryshkov@gmail.com, Cyril Hrubis <metan@ucw.cz>, arminlitzel@web.de,
       linux-kernel@vger.kernel.org, Dirk@opfer-online.de,
       Stanislav Brabec <utx@penguin.cz>, lenz@cs.wisc.edu, rpurdie@rpsys.net,
       linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
       Bart?omiej Zimo? <uzi18@o2.pl>, zaurus-devel@www.linuxtogo.org,
       Daniel Borkmann <danborkmann@googlemail.com>, thommycheck@gmail.com
Subject: Re: [suspend/resume] Re: userspace notification from module
Message-ID: <20100119051537.GA22153@elf.ucw.cz>
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 <201001162305.56972.rjw@sisk.pl>
 <20100116221929.GB8425@elf.ucw.cz>
 <201001162326.09092.rjw@sisk.pl>
 <20100117130739.GA2035@ucw.cz>
 <20100117132618.GA742@n2100.arm.linux.org.uk>
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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.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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