[MPTCP] [PATCH v2 1/4] mptcp: add and use subflow_write_space

[Florian Westphal <fw at strlen.de>]

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This will be used to unblock tasks waiting for POLLOUT event
once mptcp_poll is altered to not wait for each subflow anymore.

Signed-off-by: Florian Westphal <fw(a)strlen.de>
---
 net/mptcp/subflow.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 991198466c13..1f27a96d0439 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -610,6 +610,16 @@ static void subflow_data_ready(struct sock *sk)
 	}
 }
 
+static void subflow_write_space(struct sock *sk)
+{
+	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+	struct sock *parent = subflow->conn;
+
+	sk_stream_write_space(sk);
+	if (parent)
+		sk_stream_write_space(parent);
+}
+
 int mptcp_subflow_connect(struct sock *sk, struct sockaddr *local,
 			  struct sockaddr *remote, u8 remote_id)
 {
@@ -739,6 +749,7 @@ static int subflow_ulp_init(struct sock *sk)
 	icsk->icsk_af_ops = &subflow_specific;
 	ctx->tcp_sk_data_ready = sk->sk_data_ready;
 	sk->sk_data_ready = subflow_data_ready;
+	sk->sk_write_space = subflow_write_space;
 out:
 	return err;
 }
-- 
2.21.0