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

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Message-Id: <20210318155202.22230-8-johan@kernel.org>
Date:   Thu, 18 Mar 2021 16:52:02 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 7/7] USB: cdc-acm: always claim data interface

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 <johan@...nel.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