On Thu, 18 Jun 2015, Stefan Koch wrote:
> Interfaces are allowed per default.
> This can disabled or enabled (again) by writing 0 or 1 to
> /sys/bus/usb/devices/usbX/interface_authorized_default
>
> Signed-off-by: Stefan Koch <sk...@suse.de>
> +/*
> + * interface_authorized_default_store - store default authorization status
> + * for USB interfaces
> + *
> + * note: interface_auhorized_default is the default value
> + * for initializing the authorized attribute of interfaces
> + */
> +static ssize_t interface_authorized_default_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t count)
> +{
> + struct usb_device *usb_dev = to_usb_device(dev);
> + struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
> + int rc = count;
> + bool val;
> +
> + if (!usb_dev || !hcd)
> + return -ENODEV;
This can never happen; you should get rid of it.
> --- a/include/linux/usb/hcd.h
> +++ b/include/linux/usb/hcd.h
> @@ -120,6 +120,7 @@ struct usb_hcd {
> #define HCD_FLAG_WAKEUP_PENDING 4 /* root hub is
> resuming? */
> #define HCD_FLAG_RH_RUNNING 5 /* root hub is running? */
> #define HCD_FLAG_DEAD 6 /* controller has died?
> */
> +#define HCD_FLAG_INTERFACE_AUTHORIZED_DEFAULT 8
>
> /* The flags can be tested using these macros; they are likely to
> * be slightly faster than test_bit().
> @@ -130,6 +131,8 @@ struct usb_hcd {
> #define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U <<
> HCD_FLAG_WAKEUP_PENDING))
> #define HCD_RH_RUNNING(hcd) ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
> #define HCD_DEAD(hcd) ((hcd)->flags & (1U << HCD_FLAG_DEAD))
> +#define HCD_INTERFACE_AUTHORIZED_DEFAULT(hcd) \
> + ((hcd)->flags & (1U << HCD_FLAG_INTERFACE_AUTHORIZED_DEFAULT))
>
> /* Flags that get set only during HCD registration or removal. */
> unsigned rh_registered:1;/* is root hub registered? */
> @@ -142,6 +145,7 @@ struct usb_hcd {
> unsigned uses_new_polling:1;
> unsigned wireless:1; /* Wireless USB HCD */
> unsigned authorized_default:1;
> + unsigned interface_authorized_default:1;
What's this doing here?
Alan Stern
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