[MPTCP] [PATCH mptcp 1/3] mptcp: schedule worker when subflow is closed

[MPTCP] [PATCH mptcp 1/3] mptcp: schedule worker when subflow is closed

[Florian Westphal]

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When remote side closes a subflow we should schedule the worker to
dispose of the subflow in a timely manner.

Otherwise, SF_CLOSED event won't be generated until the mptcp
socket itself is closing or local side is closing another subflow.

Signed-off-by: Florian Westphal <fw(a)strlen.de>
---
 net/mptcp/subflow.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index b8b670cb6116..57f6361eb07c 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1413,6 +1413,13 @@ static void subflow_state_change(struct sock *sk)
 	if (mptcp_subflow_data_available(sk))
 		mptcp_data_ready(parent, sk);
 
+	if (sk->sk_state == TCP_CLOSE &&
+	    !test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &mptcp_sk(parent)->flags)) {
+		sock_hold(parent);
+		if (!schedule_work(&mptcp_sk(parent)->work))
+			sock_put(parent);
+	}
+
 	if (__mptcp_check_fallback(mptcp_sk(parent)) &&
 	    !subflow->rx_eof && subflow_is_done(sk)) {
 		subflow->rx_eof = 1;
-- 
2.26.2