[PATCH 7/7] USB: cdc-acm: always claim data interface

[Johan Hovold]

Make sure to always claim the data interface and bail out if it's
already bound to another driver or isn't authorised.

Signed-off-by: Johan Hovold <jo...@kernel.org>
---
 drivers/usb/class/cdc-acm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 6991ffd66c5d..58c444f9db5e 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1486,7 +1486,11 @@ static int acm_probe(struct usb_interface *intf,
        acm->line.bDataBits = 8;
        acm_set_line(acm, &acm->line);
 
-       usb_driver_claim_interface(&acm_driver, data_interface, acm);
+       if (!acm->combined_interfaces) {
+               rv = usb_driver_claim_interface(&acm_driver, data_interface, 
acm);
+               if (rv)
+                       goto err_remove_files;
+       }
 
        tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
                        &control_interface->dev);
@@ -1508,6 +1512,7 @@ static int acm_probe(struct usb_interface *intf,
                usb_set_intfdata(data_interface, NULL);
                usb_driver_release_interface(&acm_driver, data_interface);
        }
+err_remove_files:
        if (acm->country_codes) {
                device_remove_file(&acm->control->dev,
                                &dev_attr_wCountryCodes);
-- 
2.26.2