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: <Pine.LNX.4.44L0.1212261139060.15906-100000@netrider.rowland.org>
Date:	Wed, 26 Dec 2012 11:45:07 -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 Tue, 25 Dec 2012, Larry Finger wrote:

> 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.

I see.  Do you happen to have CONFIG_USB_EHCI_HCD=y and
CONFIG_USB_EHCI_PCI=m in your .config?  If you do, try changing
EHCI_PCI to y.

Alan Stern

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