netdev - Re: [net-2.6 PATCH] e100/e1000*/igb*/ixgb*: Add missing read memory barrier

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Date:	Sun, 08 Aug 2010 20:04:03 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, bphilips@...ell.com,
	miltonm@....com, anton@...ba.org, sonnyrao@...ibm.com,
	stable@...nel.org
Subject: Re: [net-2.6 PATCH] e100/e1000*/igb*/ixgb*: Add missing read
 memory barrier

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Sun, 08 Aug 2010 19:02:31 -0700

> Based on patches from Sonny Rao and Milton Miller...
> 
> Combined the patches to fix up clean_tx_irq and clean_rx_irq.
> 
> The PowerPC architecture does not require loads to independent bytes
> to be ordered without adding an explicit barrier.
> 
> In ixgbe_clean_rx_irq we load the status bit then load the packet data.
> With packet split disabled if these loads go out of order we get a
> stale packet, but we will notice the bad sequence numbers and drop it.
 ...
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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