linux-kernel - Re: [PATCH v4 0/4] PCI: arm64/powerpc: Fix parsing of linux,pci-probe-only

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Message-ID: <55FAF5B1.1030401@arm.com>
Date:	Thu, 17 Sep 2015 18:17:37 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Will Deacon <will.deacon@....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
Subject: Re: [PATCH v4 0/4] PCI: arm64/powerpc: Fix parsing of linux,pci-probe-only

On 17/09/15 16:30, Bjorn Helgaas wrote:
> On Fri, Sep 04, 2015 at 05:50:07PM +0100, Marc Zyngier wrote:
>> The pci-host-generic driver parses the linux,pci-probe-only property,
>> and assumes that it will have a boolean parameter.
>>
>> Turns out that the Seattle DTS file has a naked "linux,pci-probe-only"
>> property, which leads to the driver dereferencing some unsuspecting
>> memory location. Nothing really bad happens (we end up reading some
>> other bit of DT, fortunately), but that not a reason to keep it this
>> way. Turns out that the Pseries code (where this code was lifted from)
>> may suffer from the same issue.
>>
>> The first patch introduces a common (and fixed) version of that check
>> that can be used by drivers and architectures that require it. The two
>> following patches change the pci-host-generic driver and the powerpc
>> code to use it.
>>
>> Finally, the bad property is removed from the Seatle DTS, because it
>> is simply not necessary (it actually prevents me from using SR-IOV,
>> which otherwise runs fine without the probe-only thing).
>>
>> This has been tested on the offending Seattle board.
>>
>> * From v3:
>>   - Restrict the property lookup to /chosen (Rob)
>>   - Acked-by on patch #4 from Suravee
>>   - I swear this is the last time I rework these patches! ;-)
>>
>> * From v2:
>>   - Use of_property_read_u32 to safely read the property (Rob)
>>   - Add a log message to indicate when we enable probe-only
>>     (probably quite useful for debugging)
>>
>> * From v1:
>>   - Consolidate the parsing in of_pci.c (Bjorn)
>>
>> Marc Zyngier (4):
>>   of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only"
>>   PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property
>>   powerpc: PCI: Fix lookup of linux,pci-probe-only property
>>   arm64: dts: Drop linux,pci-probe-only from the Seattle DTS
>>
>>  arch/arm64/boot/dts/amd/amd-overdrive.dts |  1 -
>>  arch/powerpc/platforms/pseries/setup.c    | 14 ++------------
>>  drivers/of/of_pci.c                       | 28 ++++++++++++++++++++++++++++
>>  drivers/pci/host/pci-host-generic.c       |  9 +--------
>>  include/linux/of_pci.h                    |  3 +++
>>  5 files changed, 34 insertions(+), 21 deletions(-)
> 
> Applied with the comment tweak and acks to pci/host-generic for v4.4,
> thanks!

Turns out that the 01.org infrastructure has picked up on a compilation
bug with randconfig. The following patch seems to fix it and should be
applied on the first patch:

diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 485d625..2da5abc 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -6,6 +6,8 @@
 #include <linux/of_pci.h>
 #include <linux/slab.h>
 
+#include <asm-generic/pci-bridge.h>
+
 static inline int __of_pci_pci_compare(struct device_node *node,
 				       unsigned int data)
 {

Sorry for the annoyance.

	M.
-- 
Jazz is not dead. It just smells funny...
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