netdev - Re: [REGRESSION][BISECTED] skge: add dma

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Message-ID: <1379578732.2403.4.camel@ThinkPad-X230.localdomain>
Date:	Thu, 19 Sep 2013 12:18:52 +0400
From:	Igor Gnatenko <i.gnatenko.brain@...il.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	Mirko Lindner <mlindner@...vell.com>, linux-kernel@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	netdev@...r.kernel.org,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	member graysky <graysky@...hlinux.us>
Subject: Re: [REGRESSION][BISECTED] skge: add dma_mapping check

On Thu, 2013-09-19 at 00:08 +0200, Francois Romieu wrote:
> Igor Gnatenko <i.gnatenko.brain@...il.com> :
> > Since 136d8f377e1575463b47840bc5f1b22d94bf8f63 commit we have kernel
> > panic on:
> > 01:05.0 Ethernet controller [0200]: Marvell Technology Group Ltd.
> > 
> > Screen: https://www.dropbox.com/s/mu3t3wxpxbn4ou5/IMAG0507.jpg
> > 
> > RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1008323
> 
> Does the ugly stuff below against mainline make a difference ?
> 
> Note to testers: use a size argument above 500 for 'ping' to
> exercize the relevant code path.
Reported-and-tested-by: Vasiliy Glazov <vascom2@...il.com>
Bisected-by: Igor Gnatenko <i.gnatenko.brain@...il.com>
> 
> diff --git a/drivers/net/ethernet/marvell/skge.c b/drivers/net/ethernet/marvell/skge.c
> index ef94a59..aa85a3f 100644
> --- a/drivers/net/ethernet/marvell/skge.c
> +++ b/drivers/net/ethernet/marvell/skge.c
> @@ -3086,6 +3086,7 @@ static struct sk_buff *skge_rx_get(struct net_device *dev,
>  					       PCI_DMA_FROMDEVICE);
>  		skge_rx_reuse(e, skge->rx_buf_size);
>  	} else {
> +		struct skge_element ee = *e;
>  		struct sk_buff *nskb;
>  
>  		nskb = netdev_alloc_skb_ip_align(dev, skge->rx_buf_size);
> @@ -3098,10 +3099,10 @@ static struct sk_buff *skge_rx_get(struct net_device *dev,
>  		}
>  
>  		pci_unmap_single(skge->hw->pdev,
> -				 dma_unmap_addr(e, mapaddr),
> -				 dma_unmap_len(e, maplen),
> +				 dma_unmap_addr(&ee, mapaddr),
> +				 dma_unmap_len(&ee, maplen),
>  				 PCI_DMA_FROMDEVICE);
> -		skb = e->skb;
> +		skb = ee.skb;
>  		prefetch(skb->data);
>  	}
>  
Yes. This patch fixes problem. ping www.ru -s 500 works fine.


-- 
Igor Gnatenko
Fedora release 20 (Heisenbug)
Linux 3.11.1-300.fc20.x86_64

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