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USB: cdc-acm: only raise DTR on transitions from B0

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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.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-11-05 18:41:59 +01:00 committed by Greg Kroah-Hartman
parent ac0225f94f
commit 4473d054ce
1 changed files with 3 additions and 2 deletions
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5
drivers/usb/class/cdc-acm.c
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@ -985,11 +985,12 @@ 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);