Marcel Moolenaar
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In uart_tty_outwakeup(), check CTS/RTS flow control settings and ...
prevent sending data when CTS is de-asserted.
In uart_tty_intr(), call uart_tty_outwakeup() when the CTS signal
changed, knowing that uart_tty_outwakeup() will do the right
thing for flow control. This avoids redundant conditionals.
PR: kern/148644
Submitted by: John Wehle <john@feith.com>
MFC after: 3 days
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