From 98c0b888ed9b2e01a61159b0b10f99ba57a21486 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=A7=80=E6=89=8D=E9=81=87=E5=88=B0=E7=8C=AB?=
 <871063850@qq.com>
Date: Fri, 18 Aug 2017 18:39:32 +0800
Subject: [PATCH] add suport vmware pipe serial port

---
 serial/open_windows.go | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/serial/open_windows.go b/serial/open_windows.go
index 1e5688d..6c70a85 100644
--- a/serial/open_windows.go
+++ b/serial/open_windows.go
@@ -71,17 +71,16 @@ func openInternal(options OpenOptions) (io.ReadWriteCloser, error) {
 		}
 	}()
 
-	if err = setCommState(h, options); err != nil {
-		return nil, err
-	}
-	if err = setupComm(h, 64, 64); err != nil {
-		return nil, err
-	}
-	if err = setCommTimeouts(h, options); err != nil {
-		return nil, err
-	}
-	if err = setCommMask(h); err != nil {
-		return nil, err
+	if err = setCommState(h, options); err == nil {
+		if err = setupComm(h, 64, 64); err != nil {
+			return nil, err
+		}
+		if err = setCommTimeouts(h, options); err != nil {
+			return nil, err
+		}
+		if err = setCommMask(h); err != nil {
+			return nil, err
+		}
 	}
 
 	ro, err := newOverlapped()