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SubjectRe: 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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