[FS#160] usb-serial (pl2303) failures on mt7621 dlink dir860l-b1

[LEDE Bugs]

The following task has a new comment added:

FS#160 - usb-serial (pl2303) failures on mt7621 dlink dir860l-b1
User who did this - Russell Senior (russell)

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Not sure it's relevant, but no, the usb2 hub was not powered externally.  The pl2303 usb-serial draws very little power.  Nothing else was plugged into the usb2 hub.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=160#comment919