netdev - [PATCH net-next 04/15] ppp: Remove direct skb_queue

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Message-Id: <20180908.131012.627523884972592406.davem@davemloft.net>
Date:   Sat, 08 Sep 2018 13:10:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     netdev@...r.kernel.org
Subject: [PATCH net-next 04/15] ppp: Remove direct skb_queue_head list
 pointer access.


Add a helper, __skb_peek(), and use it in ppp_mp_reconstruct().

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 drivers/net/ppp/ppp_generic.c |  2 +-
 include/linux/skbuff.h        | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 02ad03a2fab7..500bc0027c1b 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -2400,7 +2400,7 @@ ppp_mp_reconstruct(struct ppp *ppp)
 
 	if (ppp->mrru == 0)	/* do nothing until mrru is set */
 		return NULL;
-	head = list->next;
+	head = __skb_peek(list);
 	tail = NULL;
 	skb_queue_walk_safe(list, p, tmp) {
 	again:
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 17a13e4785fc..89283b77294d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1592,6 +1592,17 @@ static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_)
 	return skb;
 }
 
+/**
+ *	__skb_peek - peek at the head of a non-empty &sk_buff_head
+ *	@list_: list to peek at
+ *
+ *	Like skb_peek(), but the caller knows that the list is not empty.
+ */
+static inline struct sk_buff *__skb_peek(const struct sk_buff_head *list_)
+{
+	return list_->next;
+}
+
 /**
  *	skb_peek_next - peek skb following the given one from a queue
  *	@skb: skb to start from
-- 
2.17.1