linux-kernel - Re: [PATCH v4 3/4] powerpc: PCI: Fix lookup of linux,pci-probe-only property

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Date:	Mon, 07 Sep 2015 18:59:43 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Will Deacon <will.deacon@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Alexander Graf <agraf@...e.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, Anton Blanchard <anton@...ba.org>
Subject: Re: [PATCH v4 3/4] powerpc: PCI: Fix lookup of linux,pci-probe-only
 property

On Fri, 2015-09-04 at 17:50 +0100, Marc Zyngier wrote:
> When find_and_init_phbs() looks for the probe-only property, it seems
> to trust the firmware to be correctly written, and assumes that there
> is a parameter to the property.
> 
> It is conceivable that the firmware could not be that perfect, and it
> could expose this property naked (at least one arm64 platform seems to
> exhibit this exact behaviour). The setup code the ends up making
> a decision based on whatever the property pointer points to, which
> is likely to be junk.
> 
> Instead, switch to the common of_pci.c implementation that doesn't
> suffer from this problem and ignore the property if the firmware
> couldn't make up its mind.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  arch/powerpc/platforms/pseries/setup.c | 14 ++------------

Thanks.

I can't find any powerpc machine that is currently using this, or much info on
what ever did use it, so I think it's pretty low impact, and the change looks
sane.

Acked-by: Michael Ellerman <mpe@...erman.id.au>

cheers


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