lantiq: strip FCS from received ethernet frames on XRX200

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 40719

target/linux/lantiq/patches-3.10/0208-lantiq-xrx200-strip-fcs.patch

@@ -0,0 +1,11 @@
+--- a/drivers/net/ethernet/lantiq_xrx200.c
++++ b/drivers/net/ethernet/lantiq_xrx200.c
+@@ -933,7 +933,7 @@ static void xrx200_hw_receive(struct xrx
+ 	struct xrx200_priv *priv = netdev_priv(dev);
+ 	struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
+ 	struct sk_buff *skb = ch->skb[ch->dma.desc];
+-	int len = (desc->ctl & LTQ_DMA_SIZE_MASK);
++	int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - ETH_FCS_LEN;
+ 	unsigned long flags;
+ 
+ 	spin_lock_irqsave(&priv->hw->lock, flags);