linux-kernel - Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM pathway

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Message-ID: <20070703224215.GA30081@srcf.ucam.org>
Date:	Tue, 3 Jul 2007 23:42:15 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM pathway

On Tue, Jul 03, 2007 at 06:21:42PM -0400, Alan Stern wrote:
> On Tue, 3 Jul 2007, Matthew Garrett wrote:
> > We're used to the idea of applications blocking when a resource they're 
> > using goes away - NFS has done it forever. 
> 
> You persist in evading my point.  I'm not worried about applications;  
> I'm worried about drivers.
> 
> Let me put it explicitly: You're writing a driver.  You're working on
> the read, write, or probe method.  You add code to check if a system
> sleep is underway.  Suppose the answer is Yes -- what does your driver
> do next?

Leave the process blocked and defer any i/o until after resume. Why does 
it need to be any more complicated than that?

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