net/smc: postpone release of clcsock

According to RFC7609 (http://www.rfc-editor.org/info/rfc7609)
first the SMC-R connection is shut down and then the normal TCP
connection FIN processing drives cleanup of the internal TCP connection.
The unconditional release of the clcsock during active socket closing
has to be postponed if the peer has not yet signalled socket closing.
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/smc/af_smc.c

@@ -145,32 +145,33 @@ static int smc_release(struct socket *sock)
 		rc = smc_close_active(smc);
 		sock_set_flag(sk, SOCK_DEAD);
 		sk->sk_shutdown |= SHUTDOWN_MASK;
-	}
-
-	sk->sk_prot->unhash(sk);
-
-	if (smc->clcsock) {
-		if (smc->use_fallback && sk->sk_state == SMC_LISTEN) {
+	} else {
+		if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
+			sock_put(sk); /* passive closing */
+		if (sk->sk_state == SMC_LISTEN) {
 			/* wake up clcsock accept */
 			rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
 		}
-		mutex_lock(&smc->clcsock_release_lock);
-		sock_release(smc->clcsock);
-		smc->clcsock = NULL;
-		mutex_unlock(&smc->clcsock_release_lock);
-	}
-	if (smc->use_fallback) {
-		if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
-			sock_put(sk); /* passive closing */
 		sk->sk_state = SMC_CLOSED;
 		sk->sk_state_change(sk);
 	}
 
+	sk->sk_prot->unhash(sk);
+
+	if (sk->sk_state == SMC_CLOSED) {
+		if (smc->clcsock) {
+			mutex_lock(&smc->clcsock_release_lock);
+			sock_release(smc->clcsock);
+			smc->clcsock = NULL;
+			mutex_unlock(&smc->clcsock_release_lock);
+		}
+		if (!smc->use_fallback)
+			smc_conn_free(&smc->conn);
+	}
+
 	/* detach socket */
 	sock_orphan(sk);
 	sock->sk = NULL;
-	if (!smc->use_fallback && sk->sk_state == SMC_CLOSED)
-		smc_conn_free(&smc->conn);
 	release_sock(sk);
 
 	sock_put(sk); /* final sock_put */

net/smc/smc_close.c

@@ -405,8 +405,13 @@ static void smc_close_passive_work(struct work_struct *work)
 	if (old_state != sk->sk_state) {
 		sk->sk_state_change(sk);
 		if ((sk->sk_state == SMC_CLOSED) &&
-		    (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket))
+		    (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) {
 			smc_conn_free(conn);
+			if (smc->clcsock) {
+				sock_release(smc->clcsock);
+				smc->clcsock = NULL;
+			}
+		}
 	}
 	release_sock(sk);
 	sock_put(sk); /* sock_hold done by schedulers of close_work */