netdev - Re: [PATCH] Add missing memory barriers to clean_rx

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Date:	Tue, 27 Jul 2010 15:41:46 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Sonny Rao <sonnyrao@...ibm.com>
Cc:	netdev@...r.kernel.org, e1000-devel@...ts.sf.net
Subject: Re: [PATCH] Add missing memory barriers to clean_rx_irq functions in 
	Intel Drivers

On Tue, Jul 27, 2010 at 15:34, Sonny Rao <sonnyrao@...ibm.com> wrote:
> This patch is similar to what was fixed in ixgbe in this patch:
>
> http://marc.info/?l=e1000-devel&m=126593062701537&w=3
>
> We should add read memory barriers to all the similar cases across the
> Intel ethernet driver family.  In the case of ixgbevf I've also added
> a missing barrier to the clean_tx_irq path because I missed it in my
> last patch.
>
> Without the barrier a processor can speculate a load ahead of the load
> which looks at the status bit and get stale information causing a
> number of different issues including invalid packet length, NULL
> pointers, or bad data since checksumming was assumed to be done
> in hardware.
>
> Signed-off-by: Milton Miller <miltonm@....com>
> Signed-off-by: Sonny Rao <sonnyrao@...ibm.com>
> cc: stable <stable@...nel.org>
>

I already have a similar patch in my queue from you Sonny, although I
see that this patch has made a few more changes.  Is this version 2?

-- 
Cheers,
Jeff
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