netdev - Re: [PATCH v2] gianfar: Add I/O barriers when touching buffer descriptor ownership.

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Message-Id: <FA9554A4-5A7D-4E03-BE28-C4B6B80D9DB9@kernel.crashing.org>
Date:	Wed, 2 May 2007 15:20:25 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Scott Wood <scottwood@...escale.com>
Cc:	jgarzik@...ox.com, netdev@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH v2] gianfar: Add I/O barriers when touching buffer descriptor ownership.

On May 2, 2007, at 3:12 PM, Scott Wood wrote:

> Kumar Gala wrote:
>> I'd rather see a wmb() instead of eieio() to keep this code non- 
>> ppc  specific.  (also, we implement wmb as eieio, so I don't keep  
>> the  comment about it being too heavy, unless you mean generically).
>
> wmb() is a sync, smp_wmb() is an eieio.  Andy told me he would not  
> accept a sync in those spots.

Sorry, was looking at the iobarrier code.

> And the driver is already ppc-specific; it uses in/out_be32.

True, but its hidden behind the gfar_read/write accessors.

Your change is a bit more blatant.

- k
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