netdev - Re: regression: tethering fails in 3.5 with iwlwifi

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Date:	Thu, 20 Sep 2012 15:58:56 +0300
From:	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: regression: tethering fails in 3.5 with iwlwifi

On Thu, 2012-09-20 at 14:45 +0200, Eric Dumazet wrote:
> I guess you only need to make sure 14 bytes of ethernet header are
> available before eth_type_trans(skb, dev);
> 
> diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
> index 61c621e..ffe5f84 100644
> --- a/net/mac80211/rx.c
> +++ b/net/mac80211/rx.c
> @@ -1795,9 +1795,13 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
> 
>                 if (skb) {
>                         /* deliver to local stack */
> -                       skb->protocol = eth_type_trans(skb, dev);
> -                       memset(skb->cb, 0, sizeof(skb->cb));
> -                       netif_receive_skb(skb);
> +                       if (pskb_may_pull(skb, sizeof(struct ethhdr))) {
> +                               skb->protocol = eth_type_trans(skb, dev);
> +                               memset(skb->cb, 0, sizeof(skb->cb));
> +                               netif_receive_skb(skb);
> +                       } else {
> +                               kfree_skb(skb);
> +                       }
>                 }
>         }

Does not help, this one does:

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 61c621e..6888586 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1797,6 +1797,7 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
 			/* deliver to local stack */
 			skb->protocol = eth_type_trans(skb, dev);
 			memset(skb->cb, 0, sizeof(skb->cb));
+			skb_linearize(skb);
 			netif_receive_skb(skb);
 		}

-- 
Best Regards,
Artem Bityutskiy

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