tcp: no need to pass prev skb around, reduces arg pressure

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 5 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e25827719e70..2d9151c94368 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1376,12 +1376,12 @@ static u8 tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
         return sacked;
 }
 
-static int tcp_shifted_skb(struct sock *sk, struct sk_buff *prev,
-                           struct sk_buff *skb,
+static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
                            struct tcp_sacktag_state *state,
                            unsigned int pcount, int shifted, int mss)
 {
         struct tcp_sock *tp = tcp_sk(sk);
+        struct sk_buff *prev = tcp_write_queue_prev(sk, skb);
 
         BUG_ON(!pcount);
 
@@ -1565,7 +1565,7 @@ static struct sk_buff *tcp_shift_skb_data(struct sock *sk, struct sk_buff *skb,
 
         if (!skb_shift(prev, skb, len))
                 goto fallback;
-        if (!tcp_shifted_skb(sk, prev, skb, state, pcount, len, mss))
+        if (!tcp_shifted_skb(sk, skb, state, pcount, len, mss))
                 goto out;
 
         /* Hole filled allows collapsing with the next as well, this is very
@@ -1584,8 +1584,7 @@ static struct sk_buff *tcp_shift_skb_data(struct sock *sk, struct sk_buff *skb,
         len = skb->len;
         if (skb_shift(prev, skb, len)) {
                 pcount += tcp_skb_pcount(skb);
-                tcp_shifted_skb(sk, prev, skb, state, tcp_skb_pcount(skb), len,
-                                mss);
+                tcp_shifted_skb(sk, skb, state, tcp_skb_pcount(skb), len, mss);
         }
 
 out: