On Mon, Jun 26, 2006 at 11:13:19PM -0700, Linus Torvalds wrote:
>
>
> On Mon, 26 Jun 2006, Dmitry Torokhov wrote:
> >
> > Please pull from:
> >
> > ????????git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git
>
> I think this (or USB) may have problems.
>
> I get a spinlock debugging fault with the current kernel on one of my
> machines at bootup, with the trace-back being:
>
> Process: khubd
> spin_bug
> _raw_spin_lock
> _spin_lock
> __mutex_lock_slowpath
> mutex_lock
> input_unregister_device
> hidinput_disconnect
> hid_disconnect
> usb_unbind_interface
> __device_release
> device_release_driver
> bus_remove_device
> device_del
> usb_disable_device
> usb_disconnect
> hub_thread
> kthread
>
> it happens pretty early after bootup, but I don't know what triggers that
> usb disconnect (it may be the hand-over from UHCI->EHCI. Greg? Does that
> make sense?)
Yes, if you have the UHCI driver loaded first, then when EHCI is loaded,
it disconnects everything on the bus and re-enumerates it.
But EHCI is built into the kernel first, before UHCI, so unless you are
using modules, nothing should be getting disconnected at boot time.
I really doubt you are using modules, so I don't know why it would be
disconnected. What does the kernel log show right before this happened?
Any chance to enable CONFIG_USB_DEBUG?
thanks,
greg k-h
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