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authorJohan Hovold <johan@kernel.org>2014-11-05 18:41:59 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-05 11:25:25 -0800
commit4473d054ceb572557954f9536731d39b20937b0c (patch)
tree0c49f80d520843b6371afb7bcce04db90f3e3f34 /drivers/usb
parentac0225f94f2af14d5db5a3ca2e9b151bb5488a52 (diff)
downloadlinux-4473d054ceb572557954f9536731d39b20937b0c.tar.bz2
USB: cdc-acm: only raise DTR on transitions from B0
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/class/cdc-acm.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 6771f884cb82..9d6495424b06 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -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);