On Wed, Oct 29, 2014 at 04:30:40PM +0100, Johan Hovold wrote:
> Make sure to only raise DTR on transitions from B0 in set_termios.
>
> Also allow set_termios to be called from open with a termios_old of
> NULL. Note that DTR will not be raised prematurely in this case.
>
> Signed-off-by: Johan Hovold <jo...@kernel.org>
> ---
> drivers/usb/class/cdc-acm.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
> index e934e19f49f5..7e58bbfd6319 100644
> --- a/drivers/usb/class/cdc-acm.c
> +++ b/drivers/usb/class/cdc-acm.c
> @@ -980,11 +980,12 @@ static void acm_tty_set_termios(struct tty_struct *tty,
> /* FIXME: Needs to clear unsupported bits in the termios */
> acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
>
> - if (!newline.dwDTERate) {
> + if (C_BAUD(tty) == B0) {
> newline.dwDTERate = acm->line.dwDTERate;
> newctrl &= ~ACM_CTRL_DTR;
> - } else
> + } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
> newctrl |= ACM_CTRL_DTR;
> + }
>
> if (newctrl != acm->ctrlout)
> acm_set_control(acm, acm->ctrlout = newctrl);
This should go to older kernels as well, right?
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