libceph: fix handling of immediate socket connect failure

If the connect() call immediately fails such that sock == NULL, we
still need con_close_socket() to reset our socket state to CLOSED.
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>

net/ceph/messenger.c

@@ -224,6 +224,8 @@ static void con_sock_state_init(struct ceph_connection *con)
 	old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
 	if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
 		printk("%s: unexpected old state %d\n", __func__, old_state);
+	dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
+	     CON_SOCK_STATE_CLOSED);
 }
 
 static void con_sock_state_connecting(struct ceph_connection *con)
@@ -233,6 +235,8 @@ static void con_sock_state_connecting(struct ceph_connection *con)
 	old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
 	if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
 		printk("%s: unexpected old state %d\n", __func__, old_state);
+	dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
+	     CON_SOCK_STATE_CONNECTING);
 }
 
 static void con_sock_state_connected(struct ceph_connection *con)
@@ -242,6 +246,8 @@ static void con_sock_state_connected(struct ceph_connection *con)
 	old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
 	if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
 		printk("%s: unexpected old state %d\n", __func__, old_state);
+	dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
+	     CON_SOCK_STATE_CONNECTED);
 }
 
 static void con_sock_state_closing(struct ceph_connection *con)
@@ -253,6 +259,8 @@ static void con_sock_state_closing(struct ceph_connection *con)
 			old_state != CON_SOCK_STATE_CONNECTED &&
 			old_state != CON_SOCK_STATE_CLOSING))
 		printk("%s: unexpected old state %d\n", __func__, old_state);
+	dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
+	     CON_SOCK_STATE_CLOSING);
 }
 
 static void con_sock_state_closed(struct ceph_connection *con)
@@ -262,8 +270,11 @@ static void con_sock_state_closed(struct ceph_connection *con)
 	old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
 	if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
 		    old_state != CON_SOCK_STATE_CLOSING &&
-		    old_state != CON_SOCK_STATE_CONNECTING))
+		    old_state != CON_SOCK_STATE_CONNECTING &&
+		    old_state != CON_SOCK_STATE_CLOSED))
 		printk("%s: unexpected old state %d\n", __func__, old_state);
+	dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
+	     CON_SOCK_STATE_CLOSED);
 }
 
 /*
@@ -448,14 +459,14 @@ static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
  */
 static int con_close_socket(struct ceph_connection *con)
 {
-	int rc;
+	int rc = 0;
 
 	dout("con_close_socket on %p sock %p\n", con, con->sock);
-	if (!con->sock)
-		return 0;
-	rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
-	sock_release(con->sock);
-	con->sock = NULL;
+	if (con->sock) {
+		rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
+		sock_release(con->sock);
+		con->sock = NULL;
+	}
 
 	/*
 	 * Forcibly clear the SOCK_CLOSED flag.  It gets set
@@ -464,6 +475,7 @@ static int con_close_socket(struct ceph_connection *con)
 	 * shut the socket down.
 	 */
 	clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags);
+
 	con_sock_state_closed(con);
 	return rc;
 }