[TCP]: Add tcp_for_write_queue_from_safe and use it in mtu_probe

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index cdd0050b97a4..6e392babda4a 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1229,6 +1229,11 @@ static inline struct sk_buff *tcp_write_queue_next(struct sock *sk, struct sk_bu
                 for (; (skb != (struct sk_buff *)&(sk)->sk_write_queue);\
                      skb = skb->next)
 
+#define tcp_for_write_queue_from_safe(skb, tmp, sk)                     \
+                for (tmp = skb->next;                                   \
+                     (skb != (struct sk_buff *)&(sk)->sk_write_queue);  \
+                     skb = tmp, tmp = skb->next)
+
 static inline struct sk_buff *tcp_send_head(struct sock *sk)
 {
         return sk->sk_send_head;