netdev - Re: [net-next 4/4] e1000e: allocate ring descriptors with dma_zalloc

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Message-ID: <1520286124.5010.3.camel@intel.com>
Date:   Mon, 05 Mar 2018 13:42:04 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     David Miller <davem@...emloft.net>
Cc:     eric.dumazet@...il.com, pkerbrat@...ray.eu, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
        mgligor@...ray.eu
Subject: Re: [net-next 4/4] e1000e: allocate ring descriptors with
 dma_zalloc_coherent

On Mon, 2018-03-05 at 16:20 -0500, David Miller wrote:
> From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Date: Mon, 05 Mar 2018 11:09:29 -0800
> 
> > On Mon, 2018-03-05 at 10:23 -0800, Eric Dumazet wrote:
> > > On Mon, 2018-03-05 at 10:16 -0800, Jeff Kirsher wrote:
> > > > From: Pierre-Yves Kerbrat <pkerbrat@...ray.eu>
> > > > 
> > > > Descriptor rings were not initialized at zero when allocated
> > > > When area contained garbage data, it caused skb_over_panic in
> > > > e1000_clean_rx_irq (if data had E1000_RXD_STAT_DD bit set)
> > > > 
> > > > This patch makes use of dma_zalloc_coherent to make sure the
> > > > ring is memset at 0 to prevent the area from containing
> > > > garbage.
> > > > 
> > > 
> > > This looks like a net candidate, fixing a bug, with 0 chance
> > > adding a
> > > regression IMO.
> > 
> > I am fine with that.  Dave, let me know if you want me to re-submit
> > this change for net/stable.
> 
> Yes, please add this patch to the net-queue pull request you also
> sent today.
> 
> Thanks.

Done.
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