[Bug 251784] USB_DO_REQUEST ERR#5 'Input/output error' for 0x0b05:0x18f3 ASUS AURA LED Controller

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251784

--- Comment #7 from Greg V <greg at unrelenting.technology> ---
So, turns out libusb does its own descriptor parsing, I can fix this in libusb:

--- i/lib/libusb/libusb20_desc.c
+++ w/lib/libusb/libusb20_desc.c
@@ -208,10 +208,9 @@ libusb20_parse_config_desc(const void *config_desc)
                        }
                        /*
                         * Sometimes USB devices have corrupt interface
-                        * descriptors and we need to overwrite the provided
-                        * interface number!
+                        * descriptors. Do not overwrite the provided
+                        * interface number though!
                         */
-                       last_if->desc.bInterfaceNumber = niface - 1;
                        last_if->extra.ptr = LIBUSB20_ADD_BYTES(ptr, ptr[0]);
                        last_if->extra.len = 0;
                        last_if->extra.type = LIBUSB20_ME_IS_RAW;

…aaand huh. This changes the number in usbconfig dump_all_desc too.
TIL usbconfig uses libusb :)

Now, this shouldn't fix it for uhid/hidraw usage (and I'd like to eventually
get hidapi-hidraw working maybe) I guess?

But I can't find 'bInterfaceNumber =' in kernel code at all. Who assigns that?

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