linux-kernel - Re: Attempted summary of suspend-blockers LKML thread

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Date:	Thu, 5 Aug 2010 15:33:02 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	david@...g.hm
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	pavel@....cz, florian@...kler.org, stern@...land.harvard.edu,
	swetland@...gle.com, peterz@...radead.org, tglx@...utronix.de,
	alan@...rguk.ukuu.org.uk
Subject: Re: Attempted summary of suspend-blockers LKML thread

On Thu, Aug 05, 2010 at 07:22:53AM -0700, david@...g.hm wrote:

> I'm not sure it's possible to completely eliminate the race, even with  
> wakelocks there is some time between the time you last check if the  
> wakelock is set and when the hardware finishes responding to your 
> commands to go to sleep (Unless you can set a level-based interrupt that 
> will wake you up as soon as you finish going to sleep)

It's typically the case that you can - we've even seen that on x86 with 
ACPI GPEs.

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