Avoid to start of communication notifier if it already is active

This happens in the QSP::clear() method, where the WaitCommEvent()
function returns with an error "The parameter is incorrect",
because it calls when the waiting already is active.

Tested with the virtual com0com and on-board serial ports.

Change-Id: I351a336f2d3c05852a654e7bccc3ff84d7aba025
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/serialport/qserialport_p.h b/src/serialport/qserialport_p.h
index 571b0de..f3b1eb8 100644
--- a/src/serialport/qserialport_p.h
+++ b/src/serialport/qserialport_p.h
@@ -236,6 +236,7 @@ public:
     HANDLE handle;
     bool parityErrorOccurred;
     QByteArray readChunkBuffer;
+    bool communicationStarted;
     bool writeStarted;
     bool readStarted;
     QWinOverlappedIoNotifier *notifier;