XHCI short transfer warning for a USB 2.0 device

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Hi Sarah,

Sorry to ask this in the middle of LCA, but Kurt ran across this and it
might be nice to get resolved soon before others hit it as well.

As Kurt reports in the Novell bugzilla:
	https://bugzilla.novell.com/show_bug.cgi?id=570362
using the 2.6.32 kernel, he gets a pretty constant stream of the
warning:
	xhci_hcd 0000:0f:00.0: WARN: short transfer on control ep
when plugging in a USB 2.0 device into a 3.0 controller.

In looking at the code, it looks like this message is coming from the
hardware itself, is that correct?  If so, this doesn't seem like
anything that a user could do anything about, and it doesn't seem to
cause any problems, so could we lower it to a "debug" message instead?

Any thoughts?

thanks,

greg k-h
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