netdev - Re: [PATCH] Fix buglets in mpc5200 FEC code that are corrupting memory.

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Date:	Fri, 9 Nov 2007 06:57:58 -0700
From:	"Grant Likely" <grant.likely@...retlab.ca>
To:	"Domen Puncer" <domen.puncer@...argo.com>,
	"Jeff Garzik" <jgarzik@...ox.com>
Cc:	"Jon Smirl" <jonsmirl@...il.com>,
	"PowerPC dev list" <Linuxppc-dev@...abs.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] Fix buglets in mpc5200 FEC code that are corrupting memory.

On 11/9/07, Domen Puncer <domen.puncer@...argo.com> wrote:
> On 09/11/07 00:31 -0500, Jon Smirl wrote:
> > This is the reason I couldn't get user space started or connect to my
> > nfs server. Patch is against current linus git.
> >
> > mpc5200 fec driver is corrupting memory. This patch fixes two bugs
> > where the wrong skb buffer was being referenced.
> >
> > Signed-off-by: Jon Smirl <jonsmirl@...il.com>
>
> Acked-by: Domen Puncer <domen.puncer@...argo.com>

Signed-off-by: Grant Likely <grant.likely@...retlab.ca>

Jeff, can you please pick this up for .24?

Thanks,
g.

>
> I can't test it at the moment, but the patch is obviously correct,
> mapped buffer should be the _same_ as submitted.
>
> >
> > ---
> >
> >  drivers/net/fec_mpc52xx.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> >
> >
> > diff --git a/drivers/net/fec_mpc52xx.c b/drivers/net/fec_mpc52xx.c
> > index a8a0ee2..ddfcc0b 100644
> > --- a/drivers/net/fec_mpc52xx.c
> > +++ b/drivers/net/fec_mpc52xx.c
> > @@ -422,7 +422,7 @@ static irqreturn_t mpc52xx_fec_rx_interrupt(int
> > irq, void *dev_id)
> >
> >               rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
> >                               (struct bcom_bd **)&bd);
> > -             dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
> > +             dma_unmap_single(&dev->dev, bd->skb_pa, rskb->len, DMA_FROM_DEVICE);
> >
> >               /* Test for errors in received frame */
> >               if (status & BCOM_FEC_RX_BD_ERRORS) {
> > @@ -467,7 +467,7 @@ static irqreturn_t mpc52xx_fec_rx_interrupt(int
> > irq, void *dev_id)
> >                       bcom_prepare_next_buffer(priv->rx_dmatsk);
> >
> >               bd->status = FEC_RX_BUFFER_SIZE;
> > -             bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
> > +             bd->skb_pa = dma_map_single(&dev->dev, skb->data,
> >                               FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
> >
> >               bcom_submit_next_buffer(priv->rx_dmatsk, skb);
> >
> >
> > --
> > Jon Smirl
> > jonsmirl@...il.com
>
> --
> Domen Puncer | Research & Development
> .............................................................................................
> Telargo d.o.o. | Zagrebška cesta 20 | 2000 Maribor | Slovenia
> .............................................................................................
> www.telargo.com
>


-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely@...retlab.ca
(403) 399-0195
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