netdev - Re: [PATCH] net: ll_temac: Fix DMA map size bug

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Date:	Tue, 12 May 2015 08:03:39 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Michal Simek <michal.simek@...inx.com>
cc:	netdev@...r.kernel.org,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	monstr@...str.eu, Fabian Frederick <fabf@...net.be>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Manuel Schölling <manuel.schoelling@....de>,
	Julia Lawall <julia.lawall@...6.fr>,
	Markus Elfring <elfring@...rs.sourceforge.net>,
	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: ll_temac: Fix DMA map size bug

On Tue, 12 May 2015, Michal Simek wrote:

> DMA allocates skb->len instead of headlen
> which is used for DMA.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> 
>  drivers/net/ethernet/xilinx/ll_temac_main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
> index ca640d04fd93..cfb6bdb37fdc 100644
> --- a/drivers/net/ethernet/xilinx/ll_temac_main.c
> +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
> @@ -705,8 +705,8 @@ static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
>  
>  	cur_p->app0 |= STS_CTRL_APP0_SOP;
>  	cur_p->len = skb_headlen(skb);
> -	cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len,
> -				     DMA_TO_DEVICE);
> +	cur_p->phys = dma_map_single(ndev->dev.parent, skb->data,
> +				skb_headlen(skb), DMA_TO_DEVICE);

I think you could align the later arguments with the right side of the 
parenthesis, as done in the original code.

julia



>  	cur_p->app4 = (unsigned long)skb;
>  
>  	for (ii = 0; ii < num_frag; ii++) {
> -- 
> 2.3.5
> 
> 
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