[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 <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index bac3654..0d7f570 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -860,7 +860,7 @@
/* 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));