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[RFC,3/4] net: Add safe reverse SKB queue walkers.

Message ID 20101005.195234.189715887.davem@davemloft.net
State RFC, archived
Delegated to: David Miller
Headers show

Commit Message

David Miller Oct. 6, 2010, 2:52 a.m. UTC 
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/linux/skbuff.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
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Patch

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0b53c43..6c3181c 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1788,6 +1788,15 @@  static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
 		     prefetch(skb->prev), (skb != (struct sk_buff *)(queue));	\
 		     skb = skb->prev)
 
+#define skb_queue_reverse_walk_safe(queue, skb, tmp)				\
+		for (skb = (queue)->prev, tmp = skb->prev;			\
+		     skb != (struct sk_buff *)(queue);				\
+		     skb = tmp, tmp = skb->prev)
+
+#define skb_queue_reverse_walk_from_safe(queue, skb, tmp)			\
+		for (tmp = skb->prev;						\
+		     skb != (struct sk_buff *)(queue);				\
+		     skb = tmp, tmp = skb->prev)
 
 static inline bool skb_has_frag_list(const struct sk_buff *skb)
 {