From 6d2a114697f2e25126cb34841696d0558249a23d Mon Sep 17 00:00:00 2001
From: Donald Tang <donaldt10@gmail.com>
Date: Sun, 10 Dec 2017 23:16:48 +0800
Subject: [PATCH] add lock for SCSI Target Service instance

---
 pkg/scsi/scsi.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pkg/scsi/scsi.go b/pkg/scsi/scsi.go
index 8d46751..e7d410f 100644
--- a/pkg/scsi/scsi.go
+++ b/pkg/scsi/scsi.go
@@ -34,11 +34,12 @@ type SCSITargetService struct {
 }
 
 var _instance *SCSITargetService
+var service sync.Once
 
 func NewSCSITargetService() *SCSITargetService {
-	if _instance == nil {
+	service.Do(func() {
 		_instance = &SCSITargetService{Targets: []*api.SCSITarget{}}
-	}
+	})
 	return _instance
 }