USB: serial: xr: fix interface leak at disconnect

Make sure to release the control interface at disconnect so that the
driver can be unbound without leaking resources (and later rebound).

Fixes: c2d405aa86b4 ("USB: serial: add MaxLinear/Exar USB to Serial driver")
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/xr_serial.c b/drivers/usb/serial/xr_serial.c
index 7be6da6..5e110b0 100644 (file)
--- a/drivers/usb/serial/xr_serial.c
+++ b/drivers/usb/serial/xr_serial.c
@@ -564,6 +564,15 @@ static int xr_probe(struct usb_serial *serial, const struct usb_device_id *id)
        return 0;
 }
 
+static void xr_disconnect(struct usb_serial *serial)
+{
+       struct usb_driver *driver = serial->type->usb_driver;
+       struct usb_interface *control_interface;
+
+       control_interface = usb_ifnum_to_if(serial->dev, 0);
+       usb_driver_release_interface(driver, control_interface);
+}
+
 static const struct usb_device_id id_table[] = {
        { USB_DEVICE(0x04e2, 0x1410) }, /* XR21V141X */
        { }
@@ -578,6 +587,7 @@ static struct usb_serial_driver xr_device = {
        .id_table               = id_table,
        .num_ports              = 1,
        .probe                  = xr_probe,
+       .disconnect             = xr_disconnect,
        .open                   = xr_open,
        .close                  = xr_close,
        .break_ctl              = xr_break_ctl,