linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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Message-ID: <alpine.LFD.2.00.1005272006560.3032@localhost.localdomain>
Date:	Thu, 27 May 2010 20:08:53 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Alan Stern <stern@...land.harvard.edu>
cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>, felipe.balbi@...ia.com,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Thu, 27 May 2010, Alan Stern wrote:

> On Thu, 27 May 2010, Thomas Gleixner wrote:
> 
> > Crap. Stop beating on those lost wakeup events. If we lose them then
> > the drivers are broken and do not handle the switch over correctly. Or
> > the suspend mechanism is broken as it does not evaluate the system
> > state correctly. Blockers are just papering over that w/o tackling the
> > real problem.
> 
> That's the point -- suspend does not evaluate the system state 
> correctly because it doesn't have the necessary information.  Suspend 
> blockers are a way of providing it that information.  They don't paper 
> over the problem; they solve it.

Nonsense. The system state is well defined when a event is pending and
we just have to say good bye to the idea that forced suspend is a good
solution. It's not as it does not guarantee the event processing in
badly written apps and it does move the power consumption to a later
point in time for those apps which acquire/drop the blockers.

Thanks,

	tglx
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