Re: error path in usb serial if tty_port_block_til_ready fails

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> Does this mean the rest of the cleanup done in serial_open() is actually
> wrong and needs to be done in close? This would mean we'd have to record

The usb code sets tty->driver_data = NULL, which the close() method
interprets (or did and will again once I apply Thadeus fixes) as 'do
nothing'

Alan
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