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>

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 819266b7e2f8e3368ddb6f20201918d44a14a889..5ca04e82ea196a491f9b20c1f1cd3e82c9c35eeb 100644 (file)
--- 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) {