From 30765d0502905a9248e5de72fc7ac83c23422861 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <florian@openwrt.org>
Date: Sun, 7 Mar 2010 00:55:26 +0000
Subject: cpmac: fix the receiving of 802.1q frames

Despite what the comment above CPMAC_SKB_SIZE says, the hardware also
needs to account for the FCS length in a received frame. This patch fix
the receiving of 802.1q frames which have 4 more bytes. While at it
unhardcode the definition and use the one from if_vlan.h.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/cpmac.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/cpmac.c b/drivers/net/cpmac.c
index 9d489421535e..55ee055d3321 100644
--- a/drivers/net/cpmac.c
+++ b/drivers/net/cpmac.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 
 #include <linux/netdevice.h>
+#include <linux/if_vlan.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/skbuff.h>
@@ -56,8 +57,8 @@ MODULE_PARM_DESC(debug_level, "Number of NETIF_MSG bits to enable");
 MODULE_PARM_DESC(dumb_switch, "Assume switch is not connected to MDIO bus");
 
 #define CPMAC_VERSION "0.5.1"
-/* frame size + 802.1q tag */
-#define CPMAC_SKB_SIZE		(ETH_FRAME_LEN + 4)
+/* frame size + 802.1q tag + FCS size */
+#define CPMAC_SKB_SIZE		(ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
 #define CPMAC_QUEUES	8
 
 /* Ethernet registers */
-- 
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