Re: Kernel 2.6.39.1: WARN: short transfer on control ep

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On Sun, Jun 05, 2011 at 04:07:42PM -0600, Eduardo Kienetz wrote:
> Hello there,
> 
> As indicated in the Subject, I'm getting this message repeatedly (20+):
> 
> xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
> 
> Along with some (in between):
> 
> xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
> 
> I'm not sure what the 0000:02:00.0, but this is one of the lines in lsusb:
> 02:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host
> Controller (rev 03)
> 
> What else could I send you guys to help sort this out?
> 
> Thank you for your work and time!

Hi Eduardo,

Don't worry about those messages, the xHCI driver is just being overly
verbose about normal USB behavior.  As long as your devices work fine
under xHCI, you can safely ignore those.

If you test with the latest release candidate from Linus, those messages
should go away.  Linux 3.0 should reduce the xHCI driver's debug
messages and move some messages that were marked as warnings to debug
level.

Sarah Sharp
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