ar71xx: ag71xx: copy received packet to avoid unaligned access in the IP stack

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20506 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
index f4c5a12..989ed0e 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
@@ -759,6 +759,23 @@ static int ag71xx_tx_packets(struct ag71xx *ag)
        return sent;
 }
 
+static int ag71xx_rx_copy_skb(struct ag71xx *ag, struct sk_buff **pskb,
+                             int pktlen)
+{
+       struct sk_buff *copy_skb;
+
+       copy_skb = netdev_alloc_skb(ag->dev, pktlen + NET_IP_ALIGN);
+       if (!copy_skb)
+               return -ENOMEM;
+
+       skb_reserve(copy_skb, NET_IP_ALIGN);
+       skb_copy_from_linear_data(*pskb, copy_skb->data, pktlen);
+       dev_kfree_skb_any(*pskb);
+       *pskb = copy_skb;
+
+       return 0;
+}
+
 static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 {
        struct net_device *dev = ag->dev;
@@ -798,6 +815,8 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 
                if (ag71xx_has_ar8216(ag))
                        err = ag71xx_remove_ar8216_header(ag, skb);
+               else
+                       err = ag71xx_rx_copy_skb(ag, &skb, pktlen);
 
                if (err) {
                        dev->stats.rx_dropped++;