linux-kernel - Re: [PATCH 1/3] PCI: vpd handle longer delays in access

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Date:	Tue, 9 Sep 2008 10:01:44 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	jbarnes@...tuousgeek.org, bhutchings@...arflare.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] PCI: vpd handle longer delays in access

On Tue, 9 Sep 2008 09:55:48 -0700
Stephen Hemminger <shemminger@...tta.com> wrote:

> On Mon, 8 Sep 2008 14:26:05 -0700
> Arjan van de Ven <arjan@...radead.org> wrote:
> 
> > On Mon, 8 Sep 2008 14:08:24 -0700
> > Stephen Hemminger <shemminger@...tta.com> wrote:
> > 
> > > 
> > > What is a good way to say "i am polling for a while"?
> > 
> > 
> > can you take a fixed time delay?
> > 
> > or use cond_resched()
> cond_resched sounds like the best suggestion.  The problem is that
> this code needs to deal with hardware that could be fast, or slow
> depending on how the device is implemented.  

one option is poll fast for <X jiffies> and then back off with sleeping
delays



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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