serdev: ttyport: ignore carrier detect to avoid hangups
Serdev currently does not support hangups so make sure to set CLOCAL to prevent loss of carrier from triggering one. Note however that not all tty drivers honour CLOCAL. Signed-off-by: NJohan Hovold <johan@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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