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

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Message-ID: <1348147353.2388.19.camel@sauron.fi.intel.com>
Date:	Thu, 20 Sep 2012 16:22:33 +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 15:04 +0200, Eric Dumazet wrote:
> Try to pull 40 bytes : Thats OK for tcp performance, because 40 bytes
> is the minimum size of IP+TCP headers
> 
> pskb_may_pull(skb, 40);

OK, I've tried almost this (see below) and it solves my issue:

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 965e6ec..7f079d0 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1798,9 +1798,13 @@ 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, 40)) {
+                               skb->protocol = eth_type_trans(skb, dev);
+                               memset(skb->cb, 0, sizeof(skb->cb));
+                               netif_receive_skb(skb);
+                       } else {
+                               kfree_skb(skb);
+                       }
                }
        }

-- 
Best Regards,
Artem Bityutskiy

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