netdev - Re: [PATCH net-next 1/4] via-rhine: commit receive buffer address before descriptor status update.

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Message-ID: <1428443685.25985.212.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 07 Apr 2015 14:54:45 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	romieu@...zoreil.com, netdev@...r.kernel.org, nix@...eri.org.uk,
	rl@...lgate.ch, gurligebis@...too.org, alexander.h.duyck@...hat.com
Subject: Re: [PATCH net-next 1/4] via-rhine: commit receive buffer address
 before descriptor status update.

On Tue, 2015-04-07 at 17:27 -0400, David Miller wrote:

> That's exactly dma_wmb().
> 
> It barriers cpu writes so that the device sees things in a certain
> order.
> 
> It's what all the most common ethernet chip drivers use in their
> descriptor handling routines now.

To be fair, only 2 drivers currently use dma_wmb()



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