USB: serial: ch341: fix initial modem-control state

commit 4e2da44691cffbfffb1535f478d19bc2dca3e62b upstream.

DTR and RTS will be asserted by the tty-layer when the port is opened
and deasserted on close (if HUPCL is set). Make sure the initial state
is not-asserted before the port is first opened as well.

Fixes: 664d5df92e88 ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 9538181..5171fc3 100644 (file)
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -270,7 +270,6 @@ static int ch341_attach(struct usb_serial *serial)
 
        spin_lock_init(&priv->lock);
        priv->baud_rate = DEFAULT_BAUD_RATE;
-       priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
 
        r = ch341_configure(serial->dev, priv);
        if (r < 0)