linux-kernel - Re: Regression in kernel 3.8-rc1 bisected to commit adfa79d: I now get many "unable to enumerate USB device" messages

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Date:	Tue, 25 Dec 2012 11:26:04 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Larry Finger <Larry.Finger@...inger.net>
cc:	LKML <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: Regression in kernel 3.8-rc1 bisected to commit adfa79d: I now
 get many "unable to enumerate USB device" messages

On Mon, 24 Dec 2012, Larry Finger wrote:

> The problem has been bisected to commit adfa79d entitled "USB: EHCI: make 
> ehci-pci a separate driver". The symptom is that my NVIDIA controller again 
> reverts to unended logging of messages of the form "hub 2-0:1.0: unable to 
> enumerate USB device on port 5".

A few more details would be helpful, such as the dmesg log (with
CONFIG_USB_DEBUG enabled).  As it is, I don't see how that commit could
cause this problem.  It should not have resulted in any changes in
behavior -- all it did was split up a driver that was one module into
two modules.

> This behavior was previously fixed with commit c618759.

That commit affected the ohci-hcd driver, whereas this one affects 
ehci-hcd.  They can't possibly be related.

Alan Stern

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