net: Add and use skb_mark_not_on_list().

An SKB is not on a list if skb->next is NULL.

Codify this convention into a helper function and use it
where we are dequeueing an SKB and need to mark it as such.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 9c4e72e9c60a..c09219e7f230 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -278,7 +278,7 @@ static int ip_finish_output_gso(struct net *net, struct sock *sk,
                 struct sk_buff *nskb = segs->next;
                 int err;
 
-                segs->next = NULL;
+                skb_mark_not_on_list(segs);
                 err = ip_fragment(net, sk, segs, mtu, ip_finish_output2);
 
                 if (err && ret == 0)
@@ -684,7 +684,7 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 
                         skb = frag;
                         frag = skb->next;
-                        skb->next = NULL;
+                        skb_mark_not_on_list(skb);
                 }
 
                 if (err == 0) {