linux-kernel - Re: [regression] pciehp hang on hp ia64 rx6600

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Message-ID: <47D80F13.7040304@pobox.com>
Date:	Wed, 12 Mar 2008 13:12:51 -0400
From:	Mark Lord <mlord@...ox.com>
To:	Alex Chiang <achiang@...com>, mlord@...ox.com,
	kristen.c.accardi@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [regression] pciehp hang on hp ia64 rx6600

Alex Chiang wrote:
> Hi Mark, Kristin,
> 
> On my hp ia64 rx6600, 'modprobe pciehp' causes lockups and a
> system hang on 2.6.25-rc4. My system often hangs when only pciehp
> is loaded and my console is sitting idle, but I can accelerate
> the hang 100% of the time by immediately doing a 'modprobe
> acpiphp' right afterwards.
> 
> I have bisected the hang down to this commit:
> 
> 0a3c33d77ff7ad5b988997536a8f09c49e35ad20 is first bad commit
> commit 0a3c33d77ff7ad5b988997536a8f09c49e35ad20
> Author: Mark Lord <lkml@....ca>
> Date:   Wed Nov 28 15:11:28 2007 -0800
> 
>     PCIE: fix PCIe Hotplug so that it works with ExpressCard slots on Dell notebooks (and others?) in conjunction with modparam of pciehp_force=1.
..

In this case, the bisection is probably not perfect,
because that original patch had a couple of bugs that
were fixed by a subsequent follow-up patch.

It is all rather fuzzy right now, because this work was all completed
at the merge window for the *previous* kernel, but has now sat bit-rotting
for nearly 6 months since I last looked at it.

That said, I'm building the latest 2.6.25-rc* to retest with here,
and hopefully we can work this out without much more fuss.

Cheers
-- 
Mark Lord
Real-Time Remedies Inc.
mlord@...ox.com
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