[SCSI] iscsi: don't switch states when just cleaning up

If recovery failed or we are in recovery only overwrite the state
if we are going to terminate the session or if we logged back in.

STOP_CONN_SUSPEND and conn_cnt are not used. We only support
a single connection session ATM, so cleanup that code while
we are working around it.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/iscsi_tcp.c

@@ -1955,30 +1955,28 @@ iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
 	if (err)
 		return err;
 
-	if (conn->stop_stage != STOP_CONN_SUSPEND) {
-		/* bind iSCSI connection and socket */
-		tcp_conn->sock = sock;
+	/* bind iSCSI connection and socket */
+	tcp_conn->sock = sock;
 
-		/* setup Socket parameters */
-		sk = sock->sk;
-		sk->sk_reuse = 1;
-		sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
-		sk->sk_allocation = GFP_ATOMIC;
+	/* setup Socket parameters */
+	sk = sock->sk;
+	sk->sk_reuse = 1;
+	sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
+	sk->sk_allocation = GFP_ATOMIC;
 
-		/* FIXME: disable Nagle's algorithm */
+	/* FIXME: disable Nagle's algorithm */
 
-		/*
-		 * Intercept TCP callbacks for sendfile like receive
-		 * processing.
-		 */
-		conn->recv_lock = &sk->sk_callback_lock;
-		iscsi_conn_set_callbacks(conn);
-		tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
-		/*
-		 * set receive state machine into initial state
-		 */
-		tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
-	}
+	/*
+	 * Intercept TCP callbacks for sendfile like receive
+	 * processing.
+	 */
+	conn->recv_lock = &sk->sk_callback_lock;
+	iscsi_conn_set_callbacks(conn);
+	tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
+	/*
+	 * set receive state machine into initial state
+	 */
+	tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
 
 	return 0;
 }

drivers/scsi/libiscsi.c

@@ -492,7 +492,7 @@ void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
 		return;
 	}
 
-	if (session->conn_cnt == 1 || session->leadconn == conn)
+	if (conn->stop_stage == 0)
 		session->state = ISCSI_STATE_FAILED;
 	spin_unlock_irqrestore(&session->lock, flags);
 	set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
@@ -652,7 +652,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 		 */
 		if (session->state == ISCSI_STATE_IN_RECOVERY) {
 			reason = FAILURE_SESSION_IN_RECOVERY;
-			goto fault;
+			goto reject;
 		}
 
 		if (session->state == ISCSI_STATE_RECOVERY_FAILED)
@@ -1411,8 +1411,8 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
 	struct iscsi_session *session = conn->session;
 	unsigned long flags;
 
-	mutex_lock(&conn->xmitmutex);
 	set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+	mutex_lock(&conn->xmitmutex);
 	if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE) {
 		if (session->tt->suspend_conn_recv)
 			session->tt->suspend_conn_recv(conn);
@@ -1498,7 +1498,6 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
 		 * unblock eh_abort() if it is blocked. re-try all
 		 * commands after successful recovery
 		 */
-		session->conn_cnt++;
 		conn->stop_stage = 0;
 		conn->tmabort_state = TMABORT_INITIAL;
 		session->age++;
@@ -1508,13 +1507,7 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
 		wake_up(&conn->ehwait);
 		return 0;
 	case STOP_CONN_TERM:
-		session->conn_cnt++;
-		conn->stop_stage = 0;
-		break;
-	case STOP_CONN_SUSPEND:
 		conn->stop_stage = 0;
-		clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
-		clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
 		break;
 	default:
 		break;
@@ -1589,28 +1582,24 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
 
 	/*
 	 * When this is called for the in_login state, we only want to clean
-	 * up the login task and connection.
+	 * up the login task and connection. We do not need to block and set
+	 * the recovery state again
 	 */
-	if (conn->stop_stage != STOP_CONN_RECOVER)
-		session->conn_cnt--;
+	if (flag == STOP_CONN_TERM)
+		session->state = ISCSI_STATE_TERMINATE;
+	else if (conn->stop_stage != STOP_CONN_RECOVER)
+		session->state = ISCSI_STATE_IN_RECOVERY;
 
 	old_stop_stage = conn->stop_stage;
 	conn->stop_stage = flag;
+	conn->c_stage = ISCSI_CONN_STOPPED;
+	set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
 	spin_unlock_bh(&session->lock);
 
 	if (session->tt->suspend_conn_recv)
 		session->tt->suspend_conn_recv(conn);
 
 	mutex_lock(&conn->xmitmutex);
-	spin_lock_bh(&session->lock);
-	conn->c_stage = ISCSI_CONN_STOPPED;
-	set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
-
-	if (session->conn_cnt == 0 || session->leadconn == conn)
-		session->state = ISCSI_STATE_IN_RECOVERY;
-
-	spin_unlock_bh(&session->lock);
-
 	/*
 	 * for connection level recovery we should not calculate
 	 * header digest. conn->hdr_size used for optimization
@@ -1620,13 +1609,11 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
 	if (flag == STOP_CONN_RECOVER) {
 		conn->hdrdgst_en = 0;
 		conn->datadgst_en = 0;
-		/*
-		 * if this is called from the eh and and from userspace
-		 * then we only need to block once.
-		 */
 		if (session->state == ISCSI_STATE_IN_RECOVERY &&
-		    old_stop_stage != STOP_CONN_RECOVER)
+		    old_stop_stage != STOP_CONN_RECOVER) {
+			debug_scsi("blocking session\n");
 			iscsi_block_session(session_to_cls(session));
+		}
 	}
 
 	session->tt->terminate_conn(conn);
@@ -1651,20 +1638,6 @@ void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 	case STOP_CONN_TERM:
 		iscsi_start_session_recovery(session, conn, flag);
 		break;
-	case STOP_CONN_SUSPEND:
-		if (session->tt->suspend_conn_recv)
-			session->tt->suspend_conn_recv(conn);
-
-		mutex_lock(&conn->xmitmutex);
-		spin_lock_bh(&session->lock);
-
-		conn->stop_stage = flag;
-		conn->c_stage = ISCSI_CONN_STOPPED;
-		set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
-
-		spin_unlock_bh(&session->lock);
-		mutex_unlock(&conn->xmitmutex);
-		break;
 	default:
 		printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
 	}

include/scsi/libiscsi.h

@@ -211,7 +211,6 @@ struct iscsi_session {
 						 * - r2tpool		   */
 	int			state;		/* session state           */
 	struct list_head	item;
-	int			conn_cnt;
 	int			age;		/* counts session re-opens */
 
 	struct list_head	connections;	/* list of connections */