From: David S. Miller <davem@davemloft.net>
Date: Tue, 23 Sep 2008 07:44:42 +0000 (-0700)
Subject: net: Add skb_queue_next().
X-Git-Tag: accepted/tizen/common/20141203.182822~19660^2~206
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=249c8b42c7e5e6f33d0ff983041f08278b137e53;p=platform%2Fkernel%2Flinux-arm64.git

net: Add skb_queue_next().

A lot of code wants to iterate over an SKB queue at the top level using
it's own control structure and iterator scheme.

Provide skb_queue_next(), which is only valid to invoke if
skb_queue_is_last() returns false.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3a5838d..d2f1778 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -486,6 +486,24 @@ static inline bool skb_queue_is_last(const struct sk_buff_head *list,
 }
 
 /**
+ *	skb_queue_next - return the next packet in the queue
+ *	@list: queue head
+ *	@skb: current buffer
+ *
+ *	Return the next packet in @list after @skb.  It is only valid to
+ *	call this if skb_queue_is_last() evaluates to false.
+ */
+static inline struct sk_buff *skb_queue_next(const struct sk_buff_head *list,
+					     const struct sk_buff *skb)
+{
+	/* This BUG_ON may seem severe, but if we just return then we
+	 * are going to dereference garbage.
+	 */
+	BUG_ON(skb_queue_is_last(list, skb));
+	return skb->next;
+}
+
+/**
  *	skb_get - reference buffer
  *	@skb: buffer to reference
  *