From d9cc20484e5e48c6a5deb4387c20fd45bfbdde8c Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sun, 16 Sep 2007 16:21:16 -0700 Subject: [NET] skbuff: Add skb_cow_head This patch adds an optimised version of skb_cow that avoids the copy if the header can be modified even if the rest of the payload is cloned. This can be used in encapsulating paths where we only need to modify the header. As it is, this can be used in PPPOE and bridging. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- drivers/net/pppoe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net') diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c index bac36546e0b..0d7f570b9a5 100644 --- a/drivers/net/pppoe.c +++ b/drivers/net/pppoe.c @@ -860,7 +860,7 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) /* Copy the data if there is no space for the header or if it's * read-only. */ - if (skb_cow(skb, sizeof(*ph) + dev->hard_header_len)) + if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) goto abort; __skb_push(skb, sizeof(*ph)); -- cgit v1.2.3