linux-kernel - Problem with xhci-hcd and Alfa AWUS036NHR

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Message-ID: <4E9C7518.7080005@lwfinger.net>
Date:	Mon, 17 Oct 2011 13:34:00 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	wireless <linux-wireless@...r.kernel.org>,
	v4mp <gaigo88@...mail.it>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Problem with xhci-hcd and Alfa AWUS036NHR

I am trying to help v4mp <gaigo88@...mail.it> with a wireless problem.

He is running Ubuntu natty 3.0.4-030004-generic and get the following items in 
his dmesg output:

[    3.963920] xhci_hcd 0000:05:00.0: WARN: short transfer on control ep
[    3.970920] xhci_hcd 0000:05:00.0: WARN: short transfer on control ep
[    3.975037] xhci_hcd 0000:05:00.0: WARN: short transfer on control ep
[    3.976097] usb 3-2: ep 0x81 - rounding interval to 64 microframes, ep desc 
says 80 microframes
[    3.984899] xhci_hcd 0000:05:00.0: WARN: short transfer on control ep

and later many of

[  545.272708] xhci_hcd 0000:05:00.0: ERROR no room on ep ring

A nearly complete dmesg output is at http://pastebin.com/7tfcBfbD. I asked the 
OP to paste the entire output, but he gave me what is posted there.

Is there a bug in the rtl8192cu USB handling that would let the device work with 
ehci-hcd and ohci-hcd, but fail with xhci-hcd?

Would commit 44f4c3e (USB: xhci: Set change bit when warm reset change is set) 
have any effect on this? I do not know if this is in 3.0.4.

I did not find any other recent commits that are aimed at xhci and looked as if 
they might address this issue. Did I miss any?

Note: The Alfa device works fine on my system with only ohci and ehci controllers.

Thanks,

Larry
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