Usb serial gadget driver bug?

1. SET_LINE_CODING handling in gs_setup_class() copies req->buf to its
port_line_coding struct but data stage has not been reached yet.

2. generic question on setup handling by gadget drivers: 
For setup-data-ack sequence, is ack to be generated by the controller
driver always?  What if it is data-out and the settings cannot be
supported by the gadget for whatever reason, how does it inform the
controller driver?

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