[PATCH mptcp-next v6 02/10] mptcp: use local variable tp in sendmsg_frag

From: Geliang Tang <[email protected]>

In mptcp_sendmsg_frag(), tcp_sk(ssk) is called multiple times.
Introduce a local variable 'tp' to hold the tcp_sock pointer and
use it throughout the function. This avoids repeated dereferencing
and improves code readability, with no functional change.

Suggested-by: Paolo Abeni <[email protected]>
Signed-off-by: Geliang Tang <[email protected]>
---
 net/mptcp/protocol.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index ffcf5a1788f6..1cab07b1b9b1 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1375,6 +1375,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
 	u64 data_seq = dfrag->data_seq + info->sent;
 	int offset = dfrag->offset + info->sent;
 	struct mptcp_sock *msk = mptcp_sk(sk);
+	struct tcp_sock *tp = tcp_sk(ssk);
 	bool zero_window_probe = false;
 	struct mptcp_ext *mpext = NULL;
 	bool can_coalesce = false;
@@ -1410,14 +1411,14 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
 		mpext = mptcp_get_ext(skb);
 		if (!mptcp_skb_can_collapse_to(data_seq, skb, mpext)) {
 			TCP_SKB_CB(skb)->eor = 1;
-			tcp_mark_push(tcp_sk(ssk), skb);
+			tcp_mark_push(tp, skb);
 			goto alloc_skb;
 		}
 
 		i = skb_shinfo(skb)->nr_frags;
 		can_coalesce = skb_can_coalesce(skb, i, dfrag->page, offset);
 		if (!can_coalesce && i >= READ_ONCE(net_hotdata.sysctl_max_skb_frags)) {
-			tcp_mark_push(tcp_sk(ssk), skb);
+			tcp_mark_push(tp, skb);
 			goto alloc_skb;
 		}
 
@@ -1471,7 +1472,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
 	skb->truesize += copy;
 	sk_wmem_queued_add(ssk, copy);
 	sk_mem_charge(ssk, copy);
-	WRITE_ONCE(tcp_sk(ssk)->write_seq, tcp_sk(ssk)->write_seq + copy);
+	WRITE_ONCE(tp->write_seq, tp->write_seq + copy);
 	TCP_SKB_CB(skb)->end_seq += copy;
 	tcp_skb_pcount_set(skb, 0);
 
-- 
2.53.0