tty: serial_core: convert uart_close to use tty_port_close
tty_port_close handles much of the common parts of tty close. Convert uart_close to use it and move the serial_core specific parts into tty_port.shutdown function. This will be needed to use tty_port functions directly from in kernel clients. This change causes ops->stop_rx() to be called after uart_wait_until_sent() is called which I think should be fine. Otherwise, the sequence of the close should be the same. Cc: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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