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Date: Sat, 7 Jul 2001 16:34:00 -0400
From: Pete Toscano <pete.lkml@toscano.org>
To: kernel <linux-kernel@vger.kernel.org>
Subject: Re: Hi all, a strange full lock in SMP-kernel 2.4.6 and 2.4.5
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Just to follow up to myself, after futher testing, it looks like it's an
SMP-related problem.  I'm not yet sure if it's an SMP-Via chipset
problem or just an SMP problem.  I've heard from two people with this
same problem.  I think one of them has a Via chipset and I'm not sure
about the other one.  

Can anybody look into this or give me a good brain dump on how I can fix
it?

Thanks,
pete

On Fri, 06 Jul 2001, Pete Toscano wrote:

> I think I've seen this same problem, at least with regards to USB
> printing.  Yesterday, I traced the problem down to a patch to usb-uhci.c
> in the transition from 2.4.3 to 2.4.4.  The problem persists today.  A
> work around for this problem is to use the alternate UHCI driver
> (uhci.o).
> 
> What motherboard and chipset are you using.  I use the Tyan Tiger 133
> motherboard with the VIA Apollo Pro 133a chipset.  Someone else who I
> heard from uses another VIA-based chipset (I think, he never replied to
> my question).  Maybe this is a VIA-related problem, like the APIC
> problem is.  (Do you use "noapic" when you boot?  He and I both have SMP
> systems too....)
> 
> I posted something on the linux-usb list yesterday about this problem
> and with all the info I was able to track down, but I have yet to see
> any response.  I've taken this as far as I can by myself.  I don't know
> enough about kernel programming or about USB to check the code in
> usb-uhci.c, but I'm more than happy to help by providing information
> and/or testing potential patches/fixes.
> 
> pete
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