netdev - Re: [PATCH] net: lpc_eth: fix tx completion

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Date:	Mon, 11 Jun 2012 20:58:40 +0200
From:	Roland Stigge <stigge@...com.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kevin.wells@....com,
	srinivas.bakki@....com, aletes.xgr@...il.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: lpc_eth: fix tx completion

On 11/06/12 19:21, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> __lpc_handle_xmit() has two bugs :
> 
> 1) It can leak skbs in case TXSTATUS_ERROR is set
> 
> 2) It can wake up txqueue while no slot was freed.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Roland Stigge <stigge@...com.de>
> Tested-by: Roland Stigge <stigge@...com.de>
> Cc: Kevin Wells <kevin.wells@....com>

Thanks!

Would be good for v3.5 and for stable v3.4 also.

> ---
>  drivers/net/ethernet/nxp/lpc_eth.c |   10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
> index 8d2666f..ff76c21 100644
> --- a/drivers/net/ethernet/nxp/lpc_eth.c
> +++ b/drivers/net/ethernet/nxp/lpc_eth.c
> @@ -946,16 +946,16 @@ static void __lpc_handle_xmit(struct net_device *ndev)
>  			/* Update stats */
>  			ndev->stats.tx_packets++;
>  			ndev->stats.tx_bytes += skb->len;
> -
> -			/* Free buffer */
> -			dev_kfree_skb_irq(skb);
>  		}
> +		dev_kfree_skb_irq(skb);
>  
>  		txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
>  	}
>  
> -	if (netif_queue_stopped(ndev))
> -		netif_wake_queue(ndev);
> +	if (pldat->num_used_tx_buffs <= ENET_TX_DESC/2) {
> +		if (netif_queue_stopped(ndev))
> +			netif_wake_queue(ndev);
> +	}
>  }
>  
>  static int __lpc_handle_recv(struct net_device *ndev, int budget)
> 

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