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, 2 insertions, 4 deletions

diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index 0fb9e3f567e6..e0f6de64afec 100644
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -207,10 +207,8 @@ static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
         struct tcf_ipt *ipt = a->priv;
         struct xt_action_param par;
 
-        if (skb_cloned(skb)) {
-                if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
-                        return TC_ACT_UNSPEC;
-        }
+        if (skb_unclone(skb, GFP_ATOMIC))
+                return TC_ACT_UNSPEC;
 
         spin_lock(&ipt->tcf_lock);