On Thu, 18 Jun 2015, Stefan Koch wrote:
> The kernel supports the device authorization because of wireless USB.
> These is usable for wired USB devices, too.
> These new interface authorization allows to enable or disable
> individual interfaces instead a whole device.
>
> If a deauthorized interface will be authorized so the driver probing must
> be triggered manually by writing INTERFACE to /sys/bus/usb/drivers_probe
>
> Signed-off-by: Stefan Koch <skoch@xxxxxxx>
> ---
> drivers/usb/core/message.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++
> drivers/usb/core/usb.h | 2 ++
> 2 files changed, 54 insertions(+)
>
> diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
> index 1e85f62..333957a 100644
> --- a/drivers/usb/core/message.c
> +++ b/drivers/usb/core/message.c
> @@ -1555,6 +1555,58 @@ static void usb_release_interface(struct device *dev)
> kfree(intf);
> }
>
> +/*
> + * usb_deauthorize_interface - deauthorize an USB interface
> + *
> + * @intf: USB interface structure
> + *
> + * Returns: 0 at success, <0 at failure
> + */
> +int usb_deauthorize_interface(struct usb_interface *intf)
> +{
> + struct device *dev = &intf->dev;
> +
> + if (!dev || !dev->parent)
> + return -ENODEV;
This can't happen; you should remove it.
> +
> + device_lock(dev->parent);
> +
> + if (intf->authorized) {
> + device_lock(dev);
> + intf->authorized = 0;
> + device_unlock(dev);
> +
> + usb_forced_unbind_intf(intf);
> + }
> +
> + device_unlock(dev->parent);
> +
> + return 0;
> +}
> +
> +/*
> + * usb_authorize_interface - authorize an USB interface
> + *
> + * @intf: USB interface structure
> + *
> + * Returns: 0 at success, <0 at failure
> + */
> +int usb_authorize_interface(struct usb_interface *intf)
> +{
> + struct device *dev = &intf->dev;
> +
> + if (!dev)
> + return -ENODEV;
This can't happen either.
Alan Stern
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