[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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Plugging a usb2 hub into the dlink's usb3 host port, and then plugging the pl2303 into the hub, and it works fine.  

It would be nice if someone else with an mt7621 or a dlink dir860l-b1 could try to replicate this problem.
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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#comment431