On Sat, 25 Aug 2012, Kevin Cernekee wrote: > I am hoping that these invalid SET_CONFIGURATION / SET_INTERFACE > requests are uncommon. In what sorts of situations will a host > request a configuration that isn't advertised in the device's > descriptors? I had trouble just convincing usb_set_interface() / > usb_driver_set_configuration() to send such a request because they > honor bInterfaceNumber / bConfigurationValue from the descriptors. A request doesn't have to be invalid to fail. Valid requests can fail for all sorts of reasons. -ENOMEM is the prototypical example. Alan Stern
