What's the rationale behind sending a Xoff character when the port is stopped ?

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Hi,

I noticed in drivers/tty/serial/8250.c that when we transmit
characters (by calling transmit_chars), we check for uart_tx_stopped
only after sending the x_char (if any). What's the rationale behind
this ? I would expect the uart not to send ANY characters (including a
Xoff character) if its throttled (or stopped).

-- 
Karthik Manamcheri
Software R&D | Instrument Control Products | National Instruments
http://www.linkedin.com/in/kmanamcheri
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