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

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Message-ID: <20100527223605.GB11364@srcf.ucam.org>
Date:	Thu, 27 May 2010 23:36:05 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	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>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Thu, May 27, 2010 at 11:23:57PM +0100, Alan Cox wrote:
> On Thu, 27 May 2010 23:09:49 +0100
> Matthew Garrett <mjg59@...f.ucam.org> wrote:
> 
> > On Thu, May 27, 2010 at 11:08:06PM +0100, Alan Cox wrote:
> > 
> > > This is I believe robust (and has been implemented on some non x86
> > > boxes). It depends on not forcing running tasks into suspend. That is the
> > > key.
> > 
> > We've already established that ACPI systems require us to force running 
> > tasks into suspend. How do we avoid the race in that situation?
> 
> Android phones do not have ACPI. Embedded platforms do not have ACPI. MID
> x86 devices do not have ACPI.

It doesn't matter. Right now there's a race condition in terms of 
wakeup events on ACPI systems. What's your proposal for fixing that?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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