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

From: Michael Ellerman
Date: Mon Sep 07 2015 - 04:59:52 EST

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@xxxxxxx>
> ---
> arch/powerpc/platforms/pseries/setup.c | 14 ++------------


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

Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>


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