Messages in this thread Patch in this message | | | From | Johan Hovold <> | Subject | [PATCH 7/7] USB: cdc-acm: always claim data interface | Date | Thu, 18 Mar 2021 16:52:02 +0100 |
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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@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
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