Lock setControlConnection to prevent races

src/libtomahawk/Source.cpp

@@ -85,6 +85,7 @@ Source::~Source()
 bool
 Source::setControlConnection( ControlConnection* cc )
 {
+    QMutexLocker locker( &m_setControlConnectionMutex );
     if ( !m_cc.isNull() && m_cc->isReady() && m_cc->isRunning() )
     {
         const QString& nodeid = Database::instance()->impl()->dbid();

src/libtomahawk/Source.h

@@ -174,6 +174,7 @@ private:
     int m_commandCount;
     QString m_lastCmdGuid;
     mutable QMutex m_cmdMutex;
+    QMutex m_setControlConnectionMutex;
 
     Tomahawk::playlistinterface_ptr m_playlistInterface;
 };