linux-kernel - [PATCH] via-rhine: fix VLAN receive handling error in 4.2.x

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Message-Id: <20151004200603.380C4F4DA@mta2.toshio.eu>
Date:	Sun,  4 Oct 2015 22:05:08 +0200
From:	Andrej Ota <andrej@....si>
To:	romieu@...zoreil.com
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net
Subject: [PATCH] via-rhine: fix VLAN receive handling error in 4.2.x

Fixes commit 810f19bcb862 ("via-rhine: add consistent memory barrier in
vlan receive code.") which broke VLAN tag parsing on receive.

Because eth_type_trans() consumes ethernet header worth of bytes, a call
to read TCI from packet using rhine_rx_vlan_tag() no longer works as it's
reading from an invalid offset.

Tested to be working on PCEngines Alix board.

Fixes: 810f19bcb862 ("via-rhine: add consistent memory barrier in vlan receive code.")
Signed-off-by: Andrej Ota <andrej@....si>
---
 drivers/net/ethernet/via/via-rhine.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c
index a832637..2b7550c 100644
--- a/drivers/net/ethernet/via/via-rhine.c
+++ b/drivers/net/ethernet/via/via-rhine.c
@@ -2134,10 +2134,11 @@ static int rhine_rx(struct net_device *dev, int limit)
 			}
 
 			skb_put(skb, pkt_len);
-			skb->protocol = eth_type_trans(skb, dev);
 
 			rhine_rx_vlan_tag(skb, desc, data_size);
 
+			skb->protocol = eth_type_trans(skb, dev);
+
 			netif_receive_skb(skb);
 
 			u64_stats_update_begin(&rp->rx_stats.syncp);
-- 
2.4.3

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