af_iucv: accelerate close for HS transport

Closing an af_iucv socket may wait for confirmation of outstanding
send requests. This patch adds confirmation code for the new
HiperSockets transport.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/iucv/af_iucv.c

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index f4ad720..32a5010 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -2293,6 +2293,13 @@
 	}
 	spin_unlock_irqrestore(&list->lock, flags);
 
+	if (sk->sk_state == IUCV_CLOSING) {
+		if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
+			sk->sk_state = IUCV_CLOSED;
+			sk->sk_state_change(sk);
+		}
+	}
+
 out_unlock:
 	bh_unlock_sock(sk);
 }