netdev - Re: [PATCH 2/3 net-next] bnx2: Add missing memory barrier in bnx2_start

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Message-Id: <20120205.224644.911937990752945293.davem@davemloft.net>
Date:	Sun, 05 Feb 2012 22:46:44 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mchan@...adcom.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 2/3 net-next] bnx2: Add missing memory barrier in
 bnx2_start_xmit()

From: "Michael Chan" <mchan@...adcom.com>
Date: Sun, 5 Feb 2012 17:24:39 -0800

> From: Vlad Zolotarov <vlad@...lemp.com>
> 
> Sync DMA descriptor before hitting the TX mailbox for weak memory model
> CPUs.
> 
> There has been discussions several years ago about this.  Some believe
> that writel() should guarantee ordering.  Others want explicit barriers
> if necessary.  Today writel() does not have the ordering guarantee and
> many other drivers use explicit barriers.
> 
> Signed-off-by: Vlad Zolotarov <vlad@...lemp.com>
> Signed-off-by: Michael Chan <mchan@...adcom.com>

Applied.
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