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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Linkui Xiao , Qingfang Deng , Sashiko Subject: [PATCH net-next v2 1/2] l2tp: ppp: remove unused backlog callback Date: Tue, 3 Nov 2026 13:56:11 +0800 Message-ID: <20261103055614.3729-1-qingfang.deng@linux.dev> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit PPPoL2TP sessions receive packets through pppol2tp_recv(), which passes packets directly to PPP or queues them on sk_receive_queue. No receive path queues packets on the session socket backlog or calls sk_receive_skb() with that socket, so pppol2tp_backlog_recv() is unused. Remove the unused callback. L2TP/IP control sockets retain their separate backlog callbacks. Reported-by: Sashiko Closes: https://lore.kernel.org/netdev/179340002340.3131.5823454250644987437@kernel.org/ Signed-off-by: Qingfang Deng --- v2: repost after net-next is open, and add Sashiko's report v1: https://lore.kernel.org/netdev/20261030070003.2590-1-qingfang.deng@linux.dev/ --- net/l2tp/l2tp_ppp.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index 4f311d473a64..15e02864bfd5 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -454,17 +454,6 @@ static struct proto pppol2tp_sk_proto = { .obj_size = sizeof(struct pppox_sock), }; -static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) -{ - int rc; - - rc = l2tp_udp_encap_recv(sk, skb); - if (rc) - kfree_skb(skb); - - return NET_RX_SUCCESS; -} - /* socket() handler. Initialize a new struct sock. */ static int pppol2tp_create(struct net *net, struct socket *sock, int kern) @@ -482,7 +471,6 @@ static int pppol2tp_create(struct net *net, struct socket *sock, int kern) sock->state = SS_UNCONNECTED; sock->ops = &pppol2tp_ops; - sk->sk_backlog_rcv = pppol2tp_backlog_recv; sk->sk_protocol = PX_PROTO_OL2TP; sk->sk_family = PF_PPPOX; sk->sk_state = PPPOX_NONE; -- 2.43.0