tcp: remove in_flight parameter from cong_avoid() methods

Commit e114a710aa505 ("tcp: fix cwnd limited checking to improve
congestion control") obsoleted in_flight parameter from
tcp_is_cwnd_limited() and its callers.

This patch does the removal as promised.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index a9fe7bc..3c94184 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -796,7 +796,7 @@
 	/* return slow start threshold (required) */
 	u32 (*ssthresh)(struct sock *sk);
 	/* do new cwnd calculation (required) */
-	void (*cong_avoid)(struct sock *sk, u32 ack, u32 acked, u32 in_flight);
+	void (*cong_avoid)(struct sock *sk, u32 ack, u32 acked);
 	/* call before changing ca_state (optional) */
 	void (*set_state)(struct sock *sk, u8 new_state);
 	/* call when cwnd event occurs (optional) */
@@ -828,7 +828,7 @@
 
 extern struct tcp_congestion_ops tcp_init_congestion_ops;
 u32 tcp_reno_ssthresh(struct sock *sk);
-void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 acked, u32 in_flight);
+void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 acked);
 extern struct tcp_congestion_ops tcp_reno;
 
 static inline void tcp_set_ca_state(struct sock *sk, const u8 ca_state)
@@ -986,10 +986,8 @@
  * risks 100% overshoot. The advantage is that we discourage application to
  * either send more filler packets or data to artificially blow up the cwnd
  * usage, and allow application-limited process to probe bw more aggressively.
- *
- * TODO: remove in_flight once we can fix all callers, and their callers...
  */
-static inline bool tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
+static inline bool tcp_is_cwnd_limited(const struct sock *sk)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);