linux-kernel - Re: The change "PCI: assign ioapic resource at hotplug" breaks my system

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Date:	Tue, 3 Oct 2006 11:02:17 -0700
From:	Stephen Hemminger <shemminger@...l.org>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	Roland Dreier <rdreier@...co.com>, linux-kernel@...r.kernel.org,
	MUNEDA Takahiro <muneda.takahiro@...fujitsu.com>,
	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...l.org>, ak@...e.de, davem@...emloft.net
Subject: Re: The change "PCI: assign ioapic resource at hotplug" breaks my
 system

On Tue, 03 Oct 2006 21:32:54 +0900
Kenji Kaneshige <kaneshige.kenji@...fujitsu.com> wrote:

> Roland Dreier wrote:
> > The change "PCI: assign ioapic resource at hotplug" (commit
> > 23186279658cea6d42a050400d3e79c56cb459b4 in Linus's tree) makes
> > networking stop working on my system (SuperMicro H8QC8 with four
> > dual-core Opteron 885 CPUs).  In particular, the on-board NIC stops
> > working, probably because it gets assigned the wrong IRQ (225 in the
> > non-working case, 217 in the working case)
> > 
> > With that patch applied, e1000 doesn't work.  Reverting just that
> > patch (shown below) from Linus's latest tree fixes things for me.
> > 
> > Please let me know what other debug information might be useful.
> > 
> 
> The cause of this problem might be an wrong assumption that the 'start'
> member of resource structure for ioapic device has non-zero value if the
> resources are assigned by firmware. The 'start' member of ioapic device
> seems not to be set even though the resources were actually assigned to
> ioapic devices by firmware.
> 
> I made a patch to fix this problem against 2.6.18-git18. This patch
> checks command register instead of checking 'start' member to see if
> the ioapic is already enabled by firmware. Unfortunately, I don't have
> any system to reproduce this problem. Could you please try it and let
> me know whether the problem is fixed? If the patch below fixes the
> problem, I'll resend it with description and Signed-off-by.
> 
> Thanks,
> Kenji Kaneshige
>

This also fixes my problems with the built in tg3 on the dual CPU Opteron
IBM workstation.
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