Re: USB device with multiple non-sequential interfaces

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Wed, 28 Nov 2007, Kevin Lloyd wrote:

> Hi all,
> 
> When I plugged in a USB device that has two interfaces that are not
> sequential, say interface#1 and interface#99 I get the following error
> message:
>        usb 2-2: config 1 has an invalid interface number: 99 but max is
> 1
> 	usb 2-2: config 1 has no interface number 1
> 
> I was wondering what the reason for this is, why would it not be okay to
> have multiple interfaces that are not sequentially numbered?

Because the USB spec says interfaces must be numbered sequentially 
starting from 0.

> Also I that it still loaded the driver for the second interface, is this
> maybe just a warning?

Yes.

Alan Stern


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