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

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Message-Id: <A20F7457-20BC-493C-B800-3933D8FC4D5C@kernel.crashing.org>
Date:	Tue, 20 Apr 2010 23:22:19 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	timur.tabi@...il.com, afleming@...escale.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] gianfar: Wait for both RX and TX to stop


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?

Its fatally buggy HW if the bits never clear or get set in the few conditions that cpu_relax() are being used.

- k--
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