net: Add skb_unclone() helper function.

This function will be used in next GRE_GSO patch. This patch does
not change any functionality.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Eric Dumazet <edumazet@google.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 0b2706abe3e3..4fd754e74eb2 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -1805,8 +1805,7 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
                 /* the filter instructions are constructed assuming
                    a four-byte PPP header on each packet */
                 if (ppp->pass_filter || ppp->active_filter) {
-                        if (skb_cloned(skb) &&
-                            pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+                        if (skb_unclone(skb, GFP_ATOMIC))
                                 goto err;
 
                         *skb_push(skb, 2) = 0;