4 files changed, 13 insertions, 7 deletions
diff --git a/src/serialport/qserialport.cpp b/src/serialport/qserialport.cpp
index 4f9d1809..7853f1a6 100644
--- a/src/serialport/qserialport.cpp
+++ b/src/serialport/qserialport.cpp
@@ -956,6 +956,10 @@ bool QSerialPort::isDataTerminalReady()
     property; otherwise \c false is returned and the error code is set to
     NotOpenError.
 
+    \note An attempt to control the RTS signal in the HardwareControl mode
+    will fail with error code set to UnsupportedOperationError, because
+    the signal is automatically controlled by the driver.
+
     \sa pinoutSignals()
 */
 bool QSerialPort::setRequestToSend(bool set)
@@ -1278,8 +1282,11 @@ qint64 QSerialPort::bytesAvailable() const
 */
 qint64 QSerialPort::bytesToWrite() const
 {
-    Q_D(const QSerialPort);
-    return QIODevice::bytesToWrite() + d->writeBuffer.size();
+    qint64 pendingBytes = QIODevice::bytesToWrite();
+#if defined(Q_OS_WIN32)
+    pendingBytes += d_func()->writeChunkBuffer.size();
+#endif
+    return pendingBytes;
 }
 
 /*!
diff --git a/src/serialport/qserialport_unix.cpp b/src/serialport/qserialport_unix.cpp
index 544658c0..4941a86d 100644
--- a/src/serialport/qserialport_unix.cpp
+++ b/src/serialport/qserialport_unix.cpp
@@ -779,7 +779,7 @@ bool QSerialPortPrivate::readNotification()
 
     if (readBufferMaxSize && bytesToRead > (readBufferMaxSize - buffer.size())) {
         bytesToRead = readBufferMaxSize - buffer.size();
-        if (bytesToRead == 0) {
+        if (bytesToRead <= 0) {
             // Buffer is full. User must read data from the buffer
             // before we can read more from the port.
             setReadNotificationEnabled(false);
diff --git a/src/serialport/qserialport_win.cpp b/src/serialport/qserialport_win.cpp
index d6a1d135..7ae40d9e 100644
--- a/src/serialport/qserialport_win.cpp
+++ b/src/serialport/qserialport_win.cpp
@@ -537,11 +537,11 @@ bool QSerialPortPrivate::startAsyncRead()
     if (readStarted)
         return true;
 
-    DWORD bytesToRead = QSERIALPORT_BUFFERSIZE;
+    qint64 bytesToRead = QSERIALPORT_BUFFERSIZE;
 
     if (readBufferMaxSize && bytesToRead > (readBufferMaxSize - buffer.size())) {
         bytesToRead = readBufferMaxSize - buffer.size();
-        if (bytesToRead == 0) {
+        if (bytesToRead <= 0) {
             // Buffer is full. User must read data from the buffer
             // before we can read more from the port.
             return false;
diff --git a/src/serialport/qserialportinfo.cpp b/src/serialport/qserialportinfo.cpp
index 2547e01d..f49051da 100644
--- a/src/serialport/qserialportinfo.cpp
+++ b/src/serialport/qserialportinfo.cpp
@@ -122,8 +122,7 @@ QSerialPortInfo::~QSerialPortInfo()
 {
 }
 
-/*! \fn void QSerialPortInfo::swap(QSerialPortInfo &other)
-
+/*!
     Swaps QSerialPortInfo \a other with this QSerialPortInfo. This operation is
     very fast and never fails.
 */