Hi,
On Thu, Mar 15, 2012 at 7:31 PM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
>> So how about using lockdep_set_class to address the problem?
>
> Can do, you say the USB spec allows for 32 interfaces, what happens if a
> device manufacturer 'mis-reads' the spec and puts 64 on? Will that
> simply not work or will we get 'fun' results?
USB spec only says that "Each configuration has one or more interfaces
and each interface has zero or more endpoints. "[1] In fact, maybe 255
interfaces can be described in configuration desc. I mean that current
USB protocol stack(usbcore) only supports 32 interfaces in one
configuration, see below:
#define USB_MAXINTERFACES 32
struct usb_host_config {
......
struct usb_interface *interface[USB_MAXINTERFACES];
......
}
[1], 9.6.3 Configuration of USB 2.0 spec
--
Ming Lei
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