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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Message-ID: <50D9EB2E.9000105@lwfinger.net>
Date:	Tue, 25 Dec 2012 12:06:38 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Alan Stern <stern@...land.harvard.edu>
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 12/25/2012 10:26 AM, Alan Stern wrote:
> 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,

You are the expert, but I am confident of my bisection. A kernel built from 
commit 3e02320 does not have the problem, but commit adfa79d does.

The dmesg output with CONFIG_USB_DEBUG enabled is posted at
http://susepaste.org/790689.

Thanks for looking at this.

Larry


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