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    Bug 
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    Resolution: Done
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    P4: Low 
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    4.8.x, 5.3.2, 5.4.1, 5.5.0 Beta
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    OS X 10.9.5, Linux
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        0c85cdb8c2601981ce313f262f7d6db951bf61ac (qtbase/5.5, 26.5.2015, 5.5)
Try to upload new file to ftp server with attached example. There's always warning in console:
QIODevice::read: device not open
[with patch]:
QIODevice::read (QTcpSocket, "QFtpDTP Passive state socket"): device not open
This is regression and "caused" by the change:
https://codereview.qt-project.org/#/c/67257/