From: Pavel Emelyanov <xemul@parallels.com>
Date: Tue, 21 Feb 2012 07:31:18 +0000 (+0000)
Subject: skb: Add skb_peek_next helper
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=da5ef6e51b327b41180b5d1000c06e8d3595a936;p=openwrt%2Fstaging%2Fblogic.git

skb: Add skb_peek_next helper

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f3cf43de3c2a..c11a44ea1bf4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -876,6 +876,24 @@ static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_)
 	return list;
 }
 
+/**
+ *	skb_peek_next - peek skb following the given one from a queue
+ *	@skb: skb to start from
+ *	@list_: list to peek at
+ *
+ *	Returns %NULL when the end of the list is met or a pointer to the
+ *	next element. The reference count is not incremented and the
+ *	reference is therefore volatile. Use with caution.
+ */
+static inline struct sk_buff *skb_peek_next(struct sk_buff *skb,
+		const struct sk_buff_head *list_)
+{
+	struct sk_buff *next = skb->next;
+	if (next == (struct sk_buff *)list_)
+		next = NULL;
+	return next;
+}
+
 /**
  *	skb_peek_tail - peek at the tail of an &sk_buff_head
  *	@list_: list to peek at