linux-kernel - Re: Gianfar driver failing on MPC8641D based board

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Date:	Mon, 01 Mar 2010 13:07:32 +0000
From:	Martyn Welch <martyn.welch@...com>
To:	linuxppc-dev list <linuxppc-dev@...abs.org>
CC:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sandeep Gopalpet <Sandeep.Kumar@...escale.com>,
	davem@...emloft.net
Subject: Re: Gianfar driver failing on MPC8641D based board

Anton Vorontsov wrote:
> diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
> index 8bd3c9f..cccb409 100644
> --- a/drivers/net/gianfar.c
> +++ b/drivers/net/gianfar.c
> @@ -2021,7 +2021,6 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
>  	}
>  
>  	/* setup the TxBD length and buffer pointer for the first BD */
> -	tx_queue->tx_skbuff[tx_queue->skb_curtx] = skb;
>  	txbdp_start->bufPtr = dma_map_single(&priv->ofdev->dev, skb->data,
>  			skb_headlen(skb), DMA_TO_DEVICE);
>  
> @@ -2053,6 +2052,10 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
>  
>  	txbdp_start->lstatus = lstatus;
>  
> +	eieio(); /* force lstatus write before tx_skbuff */
> +
> +	tx_queue->tx_skbuff[tx_queue->skb_curtx] = skb;
> +
>  	/* Update the current skb pointer to the next entry we will use
>  	 * (wrapping if necessary) */
>  	tx_queue->skb_curtx = (tx_queue->skb_curtx + 1) &
>   
I can confirm 10/10 successful boots on p2020ds and mpc8641_hpcn.

Martyn


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