From ac0f8b81ae40f18a70413916e5ef1cbc503e4743 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=98=83=20Elliot=20Shepherd?= <elliot@identitii.com>
Date: Fri, 26 Aug 2016 00:12:17 +1000
Subject: [PATCH] miner: Move CpuAgent channel creation from Start() to
 initialization (fixes #2948)

Also remove the now un-needed mutex locking in Start() and Stop()
---
 miner/agent.go | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/miner/agent.go b/miner/agent.go
index 4a4683bc6f..16f2a77230 100644
--- a/miner/agent.go
+++ b/miner/agent.go
@@ -43,8 +43,10 @@ type CpuAgent struct {
 
 func NewCpuAgent(index int, pow pow.PoW) *CpuAgent {
 	miner := &CpuAgent{
-		pow:   pow,
-		index: index,
+		pow:    pow,
+		index:  index,
+		quit:   make(chan struct{}),
+		workCh: make(chan *Work, 1),
 	}
 
 	return miner
@@ -55,25 +57,15 @@ func (self *CpuAgent) Pow() pow.PoW                  { return self.pow }
 func (self *CpuAgent) SetReturnCh(ch chan<- *Result) { self.returnCh = ch }
 
 func (self *CpuAgent) Stop() {
-	self.mu.Lock()
-	defer self.mu.Unlock()
-
 	close(self.quit)
 }
 
 func (self *CpuAgent) Start() {
-	self.mu.Lock()
-	defer self.mu.Unlock()
 
 	if !atomic.CompareAndSwapInt32(&self.isMining, 0, 1) {
 		return // agent already started
 	}
 
-	self.quit = make(chan struct{})
-	// creating current op ch makes sure we're not closing a nil ch
-	// later on
-	self.workCh = make(chan *Work, 1)
-
 	go self.update()
 }