From e21951212f03b8d805795d8f71206853b2ab344d Mon Sep 17 00:00:00 2001
From: Jiri Pirko <jiri@resnulli.us>
Date: Wed, 19 Nov 2014 14:05:01 +0100
Subject: net: move make_writable helper into common code

note that skb_make_writable already exists in net/netfilter/core.c
but does something slightly different.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/core/skbuff.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'net/core')

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 700189604f3d..d11bbe0da355 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4151,6 +4151,18 @@ err_free:
 }
 EXPORT_SYMBOL(skb_vlan_untag);
 
+int skb_ensure_writable(struct sk_buff *skb, int write_len)
+{
+	if (!pskb_may_pull(skb, write_len))
+		return -ENOMEM;
+
+	if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
+		return 0;
+
+	return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+}
+EXPORT_SYMBOL(skb_ensure_writable);
+
 /**
  * alloc_skb_with_frags - allocate skb with page frags
  *
-- 
cgit v1.2.3