netdev - Re: [PATCH] gianfar: Wait for both RX and TX to stop

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Date:	Tue, 20 Apr 2010 22:36:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	galak@...nel.crashing.org
Cc:	timur.tabi@...il.com, afleming@...escale.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] gianfar: Wait for both RX and TX to stop

From: Kumar Gala <galak@...nel.crashing.org>
Date: Tue, 20 Apr 2010 23:22:19 -0500

> 
> On Apr 20, 2010, at 8:06 PM, David Miller wrote:
> 
>> From: Timur Tabi <timur.tabi@...il.com>
>> Date: Tue, 20 Apr 2010 10:01:48 -0500
>> 
>>> On Mon, Apr 19, 2010 at 11:43 PM, Kumar Gala <galak@...nel.crashing.org> wrote:
>>> 
>>>> spin_event_timeout doesn't make sense for this.  The patch is fine.
>>> 
>>> Can you please elaborate on that?  I don't understand why you think
>>> that.  spin_event_timeout() takes an expression and a timeout, and
>>> loops over the expression calling cpu_relax(), just like this loop
>>> does.
>> 
>> Indeed it does, Kumar this request seems reasonable.
> 
> Are we saying that cpu_relax() is useless and should be removed if we are spinning on a HW register?

Kumar, take a deep breath and a step back.

spin_event_timeout() does the cpu_relax() too, that's what Timur is
trying to tell you.

The code will be basically identical as far as I can tell.
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