1 files changed, 21 insertions, 0 deletions

diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index ec5c511a9c9c..8de02ad6e352 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -1151,4 +1151,25 @@ static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
         tipc_skb_queue_splice_tail(&tmp, head);
 }
 
+/* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
+ * @list: list to be dequeued from
+ * @seqno: seqno of the expected msg
+ *
+ * returns skb dequeued from the list if its seqno is less than or equal to
+ * the expected one, otherwise the skb is still hold
+ *
+ * Note: must be used with appropriate locks held only
+ */
+static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
+                                                 u16 seqno)
+{
+        struct sk_buff *skb = skb_peek(list);
+
+        if (skb && less_eq(buf_seqno(skb), seqno)) {
+                __skb_unlink(skb, list);
+                return skb;
+        }
+        return NULL;
+}
+
 #endif