From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zygo Blaxell <vger-linux-omap-esightcorp@mailtoo.hungrycats.org>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)
Date: Thu, 27 May 2010 15:32:43 -0400
Message-ID: <20100527193243.GC25663@gibbs.hungrycats.org>
References: <20100527003943.07c17f85@lxorguk.ukuu.org.uk>
 <20100527140655.GA28048@srcf.ucam.org>
 <20100527160543.2228fc17@lxorguk.ukuu.org.uk>
 <20100527160714.GB31937@srcf.ucam.org>
 <20100527174131.18fd1c72@lxorguk.ukuu.org.uk>
 <20100527165210.GA1062@srcf.ucam.org>
 <20100527190204.14546caa@lxorguk.ukuu.org.uk>
 <20100527181239.GF3543@srcf.ucam.org>
 <20100527194840.5bca973f@lxorguk.ukuu.org.uk>
 <20100527185658.GA5703@srcf.ucam.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <20100527185658.GA5703@srcf.ucam.org>
Sender: linux-kernel-owner@vger.kernel.org
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Arve =?iso-8859-1?B?SGr4bm5lduVn?= <arve@android.com>, Florian Mickler <florian@mickler.org>, Vitaly Wool <vitalywool@gmail.com>, Peter Zijlstra <peterz@infradead.org>, LKML <linux-kernel@vger.kernel.org>, Paul@smtp1.linux-foundation.org, felipe.balbi@nokia.com, Linux OMAP Mailing List <linux-omap@vger.kernel.org>, Linux PM <linux-pm@lists.linux-foundation.org>
List-Id: linux-omap@vger.kernel.org

On Thu, May 27, 2010 at 07:56:58PM +0100, Matthew Garrett wrote:
> Even if it's using poll, it could block purely on the display if X turns 
> the screen off between poll() waking and the write being made.

That's what fcntl(fd, F_SETFL, O_NONBLOCK) is for.