[Libusb-devel] Re: Re: set_configuration: device or resource busy

[Chris F. <cd...@fo...>]

On Fri, Dec 30, 2005 at 05:01:30PM -0500, Charles Lepple wrote:
> not to nitpick, but it says "before you perform any operations
> *related to this interface*".

You're right.


> Eventually, someone might make me feel guilty enough to read this part
> of the actual USB spec again, but Jan Axelson's USB Complete basically
> says that each configuration descriptor specifies the number of
> interfaces supported by that configuration, and that the interface
> descriptors are "subordinate" to the configuration descriptor.
> 
> The new behavior of the kernel makes it easier to check whether
> someone has claimed a valid interface, since it does not allow you to
> change the configuration when any interface is already claimed.
> (Admittedly, it is probably not very common to claim an interface,
> then select a new configuration where the old interface no longer
> exists...)

Thanks very much for the explanation.  I had it bass ackwards.

- Chris