mptcp: pm: ADD_ADDR rtx: return early if no retrans

commit 62a9b19dce77e72426f049fb99b9d1d032b9a8ea upstream.

No need to iterate over all subflows if there is no retransmission
needed.

Exit early in this case then.

Fixes: 30549eebc4d8 ("mptcp: make ADD_ADDR retransmission timeout adaptive")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260505-net-mptcp-pm-fixes-7-1-rc3-v1-8-fca8091060a4@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index d6e014a0999f525b1162a3bb6ef691c50c1dcf79..3c152bf66cd5aca2f3e420d4b9d05777b70ecbd9 100644 (file)
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -311,6 +311,9 @@ static unsigned int mptcp_adjust_add_addr_timeout(struct mptcp_sock *msk)
        struct mptcp_subflow_context *subflow;
        unsigned int max = 0, max_stale = 0;
 
+       if (!rto)
+               return 0;
+
        mptcp_for_each_subflow(msk, subflow) {
                struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
                struct inet_connection_sock *icsk = inet_csk(ssk);