On Thu, 5 Jul 2012, Sarah Sharp wrote:

> When a user runs `echo 0 > bConfigurationValue` for a USB 3.0 device,
> usb_disable_device() is called.  This function disables all drivers,
> deallocates interfaces, and sets the device configuration value to 0
> (unconfigured).  The USB core doesn't actually unconfigure the device by
> sending a Set Configuration 0 command because some devices don't like
> that command, even though it is a legal request.

No, no.  The core _does_ send a Set-Config(0) request.  However that 
doesn't seem to be relevant for this patch.

Alan Stern

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