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serdev: ttyport: ignore carrier detect to avoid hangups

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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: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-11-03 15:30:58 +01:00 committed by Greg Kroah-Hartman
parent 51899a63b4
commit cda64188ca
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serdev/serdev-ttyport.c
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@ -115,6 +115,8 @@ static int ttyport_open(struct serdev_controller *ctrl)
ktermios.c_cflag &= ~(CSIZE | PARENB);
ktermios.c_cflag |= CS8;
ktermios.c_cflag |= CRTSCTS;
/* Hangups are not supported so make sure to ignore carrier detect. */
ktermios.c_cflag |= CLOCAL;
tty_set_termios(tty, &ktermios);
set_bit(SERPORT_ACTIVE, &serport->flags);