From: Paolo Abeni pabeni@redhat.com
commit a5cb752b125766524c921faab1a45cc96065b0a7 upstream.
Beyond reducing code duplication this also avoids scheduling the mptcp_worker on a closed socket on some edge scenarios.
The addressed issue is actually older than the blamed commit below, but this fix needs it as a pre-requisite.
Fixes: ba8f48f7a4d7 ("mptcp: introduce mptcp_schedule_work") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni pabeni@redhat.com Reviewed-by: Matthieu Baerts matthieu.baerts@tessares.net Signed-off-by: Matthieu Baerts matthieu.baerts@tessares.net Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/mptcp/options.c | 5 ++--- net/mptcp/subflow.c | 18 ++++++------------ 2 files changed, 8 insertions(+), 15 deletions(-)
--- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -1156,9 +1156,8 @@ bool mptcp_incoming_options(struct sock */ if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) { if (mp_opt.data_fin && mp_opt.data_len == 1 && - mptcp_update_rcv_data_fin(msk, mp_opt.data_seq, mp_opt.dsn64) && - schedule_work(&msk->work)) - sock_hold(subflow->conn); + mptcp_update_rcv_data_fin(msk, mp_opt.data_seq, mp_opt.dsn64)) + mptcp_schedule_work((struct sock *)msk);
return true; } --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -360,9 +360,8 @@ void mptcp_subflow_reset(struct sock *ss
tcp_send_active_reset(ssk, GFP_ATOMIC); tcp_done(ssk); - if (!test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &mptcp_sk(sk)->flags) && - schedule_work(&mptcp_sk(sk)->work)) - return; /* worker will put sk for us */ + if (!test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &mptcp_sk(sk)->flags)) + mptcp_schedule_work(sk);
sock_put(sk); } @@ -1010,8 +1009,8 @@ static enum mapping_status get_mapping_s skb_ext_del(skb, SKB_EXT_MPTCP); return MAPPING_OK; } else { - if (updated && schedule_work(&msk->work)) - sock_hold((struct sock *)msk); + if (updated) + mptcp_schedule_work((struct sock *)msk);
return MAPPING_DATA_FIN; } @@ -1114,17 +1113,12 @@ static void mptcp_subflow_discard_data(s /* sched mptcp worker to remove the subflow if no more data is pending */ static void subflow_sched_work_if_closed(struct mptcp_sock *msk, struct sock *ssk) { - struct sock *sk = (struct sock *)msk; - if (likely(ssk->sk_state != TCP_CLOSE)) return;
if (skb_queue_empty(&ssk->sk_receive_queue) && - !test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) { - sock_hold(sk); - if (!schedule_work(&msk->work)) - sock_put(sk); - } + !test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) + mptcp_schedule_work((struct sock *)msk); }
static bool subflow_can_fallback(struct mptcp_subflow_context *subflow)