Start the write timer only when it is inactive

Change-Id: Ie6dd49bec6add204b45f15ff344ba6c92adedb0a
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Alex Trotsenko <alex1973tr@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/serialport/qserialport_win.cpp b/src/serialport/qserialport_win.cpp
index ae32fcf..46fc9d9 100644
--- a/src/serialport/qserialport_win.cpp
+++ b/src/serialport/qserialport_win.cpp
@@ -627,7 +627,8 @@ qint64 QSerialPortPrivate::writeData(const char *data, qint64 maxSize)
             QObjectPrivate::connect(startAsyncWriteTimer, &QTimer::timeout, this, &QSerialPortPrivate::_q_startAsyncWrite);
             startAsyncWriteTimer->setSingleShot(true);
         }
-        startAsyncWriteTimer->start(0);
+        if (!startAsyncWriteTimer->isActive())
+            startAsyncWriteTimer->start();
     }
     return maxSize;
 }