>From: Greg KH <[EMAIL PROTECTED]>
>To: D Willingham <[EMAIL PROTECTED]>
>CC: [EMAIL PROTECTED]
>Subject: Re: [Linux-usb-users] Oops in Kernel 2.4.19 if USB devices
>connected during boot.
>Date: Tue, 6 Aug 2002 19:31:48 -0700
>
>On Sun, Aug 04, 2002 at 02:19:34AM +0100, D Willingham wrote:
> > Kernel 2.4.19 USB produces an Oops if devices are connected when the
> > computer is rebooted.
> >
> > If I boot into kernel 2.4.19 with devices connected to the USB ports,
>then
> > something in the kernel usb produces an oops. This only happens if the
> > devices are connected when the computer is rebooted. If devices are
> > connected later, then the system operates correctly.
> > The system works fine in with 2.4.18 if devices are left connected.
> >
> > The debugging outputs follow:
>
>If you use the uhci.o driver instead (the JE Alternate UHCI driver) does
>the same oops happen?
>
>thanks,
>
>greg k-h
Hi,
I have done a little further checking. If I step through the services,
then the oops occurs when kudzu checks for new hardware.
If I change to use the alternate uhci driver, then the problem doesn't
occur. I think I need to check my configuration scripts (RH7.1) and my
kernel options, as I also managed to make the problem go away by changing my
kernel options...
I think that the problem is caused by having the following kernel options:
usb Y, usb-uhci M, uhci M. If I change to either
all modules or all included then the problem disappears (a case of RTFM).
My guess is that kudzu makes the usb core try to access something which is
in the usb-uhci module, but doesn't install the module first. Hence the
oops.
Thanks for the suggestion of trying uhci, it made me think enough to find
what I guess is the probable cause, and get things working.
Dave
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