linux-kernel - Re: [RFC] lp_events: an lternitive to suspend blocker user mode and kernel API

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Date:	Tue, 1 Jun 2010 00:45:21 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	markgross@...gnar.org
Cc:	Neil Brown <neilb@...e.de>, Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Brian Swetland <swetland@...gle.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	mark.gross@...el.com, Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RFC] lp_events: an lternitive to suspend blocker user mode and kernel API

On Tuesday 01 June 2010, mark gross wrote:
> On Mon, May 31, 2010 at 09:57:53AM +1000, Neil Brown wrote:
...
> > So I would suggest modifying your proposal to simply create a new 'input'
> > device.  Any driver that supports wake-from-suspend queues an event to that
> > device when a wakeup event occurs.  If the device is open and has any queued
> > events, then a suspend request such as 'echo mem > /sys/power/state' completes
> > without going into full suspend.
> 
> /me likes.
>  
> > Then you just need to convince us that this mechanism can be used without any
> > race problems.  If it can, then it would certainly be a simple and
> > unobtrusive approach.
> 
> Lets find out.

Simple question: how is that better than the Alan Stern's proposed approach?

Rafael
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