From 8c1527132c25512563b197b35453c7da22b4d699 Mon Sep 17 00:00:00 2001
From: Miguel Angel Alvarez <ma.alvarez@ziv.es>
Date: Thu, 14 Dec 2006 19:49:35 +0100
Subject: [PATCH] USB: fix interaction between different interfaces in an
 "Option" usb device

Just the serial port in the first interface should control DTR and RTS
lines. This way, the closing of the rest of the ports does not produce a=
hangup in the communication.

Signed-off-by: Miguel Angel Alvarez <ma.alvarez@ziv.es>
Signed-off-by: Matthias Urlichs <matthias@urlichs.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/usb/serial/option.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 819266b7e2f8..5ca04e82ea19 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -625,6 +625,9 @@ static int option_send_setup(struct usb_serial_port *port)
 
 	dbg("%s", __FUNCTION__);
 
+	if (port->number != 0)
+		return 0;
+
 	portdata = usb_get_serial_port_data(port);
 
 	if (port->tty) {