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net: fec: fix receive VLAN CTAG HW acceleration issue 

The current driver support receive VLAN CTAG HW acceleration feature
(NETIF_F_HW_VLAN_CTAG_RX) through software simulation. There calls the
api .skb_copy_to_linear_data_offset() to skip the VLAN tag, but there
have overlap between the two memory data point range. The patch just fix
the issue.

V2:
Michael Grzeschik suggest to use memmove() instead of skb_copy_to_linear_data_offset().

Reported-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Fixes: 1b7bde6d65 ("net: fec: implement rx_copybreak to improve rx performance")
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nimrod Andy 2015-03-10 19:09:41 +08:00 committed by David S. Miller
parent 5a3dba7a5f
commit af5cbc9822
1 changed files with 1 additions and 2 deletions
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3
drivers/net/ethernet/freescale/fec_main.c
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@ -1479,8 +1479,7 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
vlan_packet_rcvd = true;
skb_copy_to_linear_data_offset(skb, VLAN_HLEN,
data, (2 * ETH_ALEN));
memmove(skb->data + VLAN_HLEN, data, ETH_ALEN * 2);
skb_pull(skb, VLAN_HLEN);
}