> -----Original Message-----
quoted text
> From: linux-usb-owner@vger.kernel.org [mailto:linux-usb-
> owner@vger.kernel.org] On Behalf Of matthieu castet
> Sent: Wednesday, March 31, 2010 2:22 PM
> To: linux-usb@vger.kernel.org
> Subject: ehci-hang on 2.6.32
> 
> Hi,
> 
> 
> since some kernels, high speed usb hang after some random time.
> 
> Here [1] is a trace of the hang with debug enabled for ehci.
> 
> When the hang occurs a device is disconnected, and then enumerated again.
> The enumeration fails and fallback to full-speed.
> If new device are plugged, high speed enumeration fails and fallback to
> full-speed.
> 

If I remember, on a working HS enumeration on ehci, 
the Port status continues to be sig=se0 PE CONNECT

A transition to PEC CSC is not normal
ehci_hcd 0000:00:10.3: GetStatus port 6 status 00100a POWER sig=se0 PEC CSC

CSC -> Change in current status... maybe some kind of current change condition !!

quoted text
> 
> Any idea what could cause the failure ?
> Failing hardware ?
> 
<snip>
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