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SubjectRe: [PATCH] USB: serial: add nt124 usb to serial driver

While working on the tx_empty changes you suggested it occurred to me
that it might not be obvious to others that the firmware doesn't send
a packet with the NT124_CTRL_TXEMPTY flag cleared when it begins
transmitting. The practical implication is that if the driver sets
tx_empty = true when it sees NT124_CTRL_TXEMPTY, tx_empty must be
reset to false somewhere when more data is transmitted. Perhaps I
could add prepare_write_buffer and do it in there before calling
usb_serial_generic_prepare_write_buffer(). Does that sound acceptable?
If so I'll also initialize tx_empty = true in nt124_port_probe.


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