netdev - Re: [PATCH] ehea: Fixing statistics

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Date:	Tue, 26 Oct 2010 20:48:40 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	leitao@...ux.vnet.ibm.com
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ehea: Fixing statistics

Le mardi 26 octobre 2010 à 14:03 -0400, leitao@...ux.vnet.ibm.com a
écrit :
> @@ -2296,6 +2314,7 @@ static int ehea_start_xmit(struct sk_buff *skb, struct net_device *dev)
>  
>  	ehea_post_swqe(pr->qp, swqe);
>  	pr->tx_packets++;
> +	pr->tx_bytes += skb->len;
>  
>  	if (unlikely(atomic_read(&pr->swqe_avail) <= 1)) {
>  		spin_lock_irqsave(&pr->netif_queue, flags);

This seems very suspicious to me. Lets take a look at this driver.

ehea_xmit3() frees the skb.

Yet, you happily use skb after it... kaboom...

Note: driver already uses skb after its freeing, before your patch.

        if (vlan_tx_tag_present(skb)) {
                swqe->tx_control |= EHEA_SWQE_VLAN_INSERT;
                swqe->vlan_tag = vlan_tx_tag_get(skb);
        }

How can it works ?



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