last patch introduces a copy of each descriptor for each function. Most gadgets were doing this but not all of them. The remaining patches are fixes which I noticed while inspecting each function. One thing that is still not done properly: We have no function to return/free endpoints and interface numbers. For endpoints, some gadgets do "ep->driver_data = NULL" to free them. This does only work for UDCs which have the endpoint number in their name. The endpoints which use a auto created number need the counter reset. Currently this is not an issue because composite resets these counter. I think it will be required to add and remove function with configfs.
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