linux-kernel - Re: [patch][Intel-IOMMU] Fix for IOMMU early crash

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Message-ID: <18150.61732.490669.269794@cargo.ozlabs.ibm.com>
Date:	Wed, 12 Sep 2007 05:48:52 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
Cc:	akpm@...l.org, Greg KH <greg@...ah.com>, muli@...ibm.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	kristen.c.accardi@...el.com
Subject: Re: [patch][Intel-IOMMU] Fix for IOMMU early crash

Keshavamurthy, Anil S writes:

> Subject: Fix IOMMU early crash
> 
> This patch avoids copying pci_bus's->sysdata to
> pci_dev's->sysdata as one can easily obtain
> the same through pci_dev->bus->sysdata.

At the moment this will cause ppc64 to crash, since we rely on
pci_dev->sysdata pointing to some node in the firmware device tree,
either the device's node or the node for a parent bus.

We could change the ppc64 code to use pci_dev->bus->sysdata in the
case when pci_dev->sysdata is NULL, which would fix the problem.  I
think that change should be incorporated as part of this patch so that
we don't break git bisection.

In other words I don't want to see this patch applied as it stands.

Paul.
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