---

yaml
---
r: 64788
b: refs/heads/master
c: 6724add
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 96809f1b15eddae2325b2ab78e6f931edc969074
+refs/heads/master: 6724add1b5cfb020ba8f5532efe430d1ccd5fc30

trunk/drivers/scsi/libiscsi.c

@@ -1056,7 +1056,9 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
 	ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
 					    NULL, 0);
 	if (!ctask->mtask) {
+		spin_unlock_bh(&session->lock);
 		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+		spin_lock_bh(&session->lock)
 		debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt);
 		return -EPERM;
 	}
@@ -1073,6 +1075,7 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
 		debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
 	}
 	spin_unlock_bh(&session->lock);
+	mutex_unlock(&session->eh_mutex);
 	scsi_queue_work(session->host, &conn->xmitwork);
 
 	/*
@@ -1090,6 +1093,7 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
 	if (signal_pending(current))
 		flush_signals(current);
 	del_timer_sync(&conn->tmabort_timer);
+	mutex_lock(&session->eh_mutex);
 	spin_lock_bh(&session->lock);
 	return 0;
 }
@@ -1165,31 +1169,45 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
 	__iscsi_put_ctask(ctask);
 }
 
+static void iscsi_suspend_tx(struct iscsi_conn *conn)
+{
+	set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+	scsi_flush_work(conn->session->host);
+}
+
+static void iscsi_start_tx(struct iscsi_conn *conn)
+{
+	clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+	scsi_queue_work(conn->session->host, &conn->xmitwork);
+}
+
 int iscsi_eh_abort(struct scsi_cmnd *sc)
 {
+	struct Scsi_Host *host = sc->device->host;
+	struct iscsi_session *session = iscsi_hostdata(host->hostdata);
 	struct iscsi_cmd_task *ctask;
 	struct iscsi_conn *conn;
-	struct iscsi_session *session;
 	int rc;
 
+	mutex_lock(&session->eh_mutex);
+	spin_lock_bh(&session->lock);
 	/*
 	 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
 	 * got the command.
 	 */
 	if (!sc->SCp.ptr) {
 		debug_scsi("sc never reached iscsi layer or it completed.\n");
+		spin_unlock_bh(&session->lock);
+		mutex_unlock(&session->eh_mutex);
 		return SUCCESS;
 	}
 
 	ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
 	conn = ctask->conn;
-	session = conn->session;
 
 	conn->eh_abort_cnt++;
 	debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
 
-	spin_lock_bh(&session->lock);
-
 	/*
 	 * If we are not logged in or we have started a new session
 	 * then let the host reset code handle this
@@ -1226,6 +1244,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
 	switch (conn->tmabort_state) {
 	case TMABORT_SUCCESS:
 		spin_unlock_bh(&session->lock);
+		iscsi_suspend_tx(conn);
 		/*
 		 * clean up task if aborted. grab the recv lock as a writer
 		 */
@@ -1234,11 +1253,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
 		fail_command(conn, ctask, DID_ABORT << 16);
 		spin_unlock(&session->lock);
 		write_unlock_bh(conn->recv_lock);
-		/*
-		 * make sure xmit thread is not still touching the
-		 * ctask/scsi_cmnd
-		 */
-		scsi_flush_work(session->host);
+		iscsi_start_tx(conn);
 		goto success_unlocked;
 	case TMABORT_NOT_FOUND:
 		if (!ctask->sc) {
@@ -1258,12 +1273,14 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
 	spin_unlock_bh(&session->lock);
 success_unlocked:
 	debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
+	mutex_unlock(&session->eh_mutex);
 	return SUCCESS;
 
 failed:
 	spin_unlock_bh(&session->lock);
 failed_unlocked:
 	debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
+	mutex_unlock(&session->eh_mutex);
 	return FAILED;
 }
 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
@@ -1410,6 +1427,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
 	session->max_cmdsn = initial_cmdsn + 1;
 	session->max_r2t = 1;
 	session->tt = iscsit;
+	mutex_init(&session->eh_mutex);
 
 	/* initialize SCSI PDU commands pool */
 	if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
@@ -1743,9 +1761,22 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
 {
 	int old_stop_stage;
 
+	mutex_lock(&session->eh_mutex);
 	spin_lock_bh(&session->lock);
 	if (conn->stop_stage == STOP_CONN_TERM) {
 		spin_unlock_bh(&session->lock);
+		mutex_unlock(&session->eh_mutex);
+		return;
+	}
+
+	/*
+	 * The LLD either freed/unset the lock on us, or userspace called
+	 * stop but did not create a proper connection (connection was never
+	 * bound or it was unbound then stop was called).
+	 */
+	if (!conn->recv_lock) {
+		spin_unlock_bh(&session->lock);
+		mutex_unlock(&session->eh_mutex);
 		return;
 	}
 
@@ -1762,9 +1793,9 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
 	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);
-	scsi_flush_work(session->host);
+
+	iscsi_suspend_tx(conn);
 
 	write_lock_bh(conn->recv_lock);
 	set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
@@ -1793,6 +1824,7 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
 	fail_all_commands(conn);
 	flush_control_queues(session, conn);
 	spin_unlock_bh(&session->lock);
+	mutex_unlock(&session->eh_mutex);
 }
 
 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)

trunk/include/scsi/libiscsi.h

@@ -205,6 +205,13 @@ struct iscsi_queue {
 };
 
 struct iscsi_session {
+	/*
+	 * Syncs up the scsi eh thread with the iscsi eh thread when sending
+	 * task management functions. This must be taken before the session
+	 * and recv lock.
+	 */
+	struct mutex		eh_mutex;
+
 	/* iSCSI session-wide sequencing */
 	uint32_t		cmdsn;
 	uint32_t		exp_cmdsn;