From 5dffab743986d20464efc0bfbec04c75d8075c66 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Tue, 10 Dec 2013 16:23:47 -0800
Subject: [PATCH] packer/rpc: need a real lock for closing

---
 packer/rpc/muxconn.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packer/rpc/muxconn.go b/packer/rpc/muxconn.go
index 63ac39139..08c28bb25 100644
--- a/packer/rpc/muxconn.go
+++ b/packer/rpc/muxconn.go
@@ -48,8 +48,8 @@ func NewMuxConn(rwc io.ReadWriteCloser) *MuxConn {
 // Close closes the underlying io.ReadWriteCloser. This will also close
 // all streams that are open.
 func (m *MuxConn) Close() error {
-	m.mu.RLock()
-	defer m.mu.RUnlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
 
 	// Close all the streams
 	for _, w := range m.streams {