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Date: Wed, 11 Mar 2015 12:37:42 -0400
From: Murali Karicheri <m-karicheri2@ti.com>
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To: Rob Herring <robherring2@gmail.com>
CC: Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Grant Likely <grant.likely@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>, Arnd Bergmann <arnd@arndb.de>,
        Suravee Suthikulanit <Suravee.Suthikulpanit@amd.com>,
        Will Deacon <will.deacon@arm.com>, Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH] pci: of : fix BUG: unable to handle kernel
References: <1426001139-18419-1-git-send-email-m-karicheri2@ti.com> <CAL_JsqJPvW5q4XwwenFTHrDG4cU5uTd7n-vLKj0mdV9FbVC4Ag@mail.gmail.com> <20150311124911.GA8656@n2100.arm.linux.org.uk> <55005F0F.5080302@ti.com> <CAL_JsqLi+bo=zEobrduWW9D1KtTGtfO17XYw6jGjh_u_foy_VA@mail.gmail.com>
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On 03/11/2015 11:59 AM, Rob Herring wrote:
> On Wed, Mar 11, 2015 at 10:28 AM, Murali Karicheri<m-karicheri2@ti.com>  wrote:
>> On 03/11/2015 08:49 AM, Russell King - ARM Linux wrote:
>>>
>>> On Wed, Mar 11, 2015 at 07:35:45AM -0500, Rob Herring wrote:
>>>>
>>>> On Tue, Mar 10, 2015 at 10:25 AM, Murali Karicheri<m-karicheri2@ti.com>
>>>> wrote:
>>>>>
>>>>> On some platforms such as that based on x86, ia64 etc, root bus is
>>>>> created with parent node passed in as NULL to pci_create_root_bus().
>>>>> On these platforms, the patch series "PCI: get DMA configuration from
>>>>> parent device" when applied causes kernel crash. So add a check for this
>>>>> in of_pci_dma_configure()
>>>>
>>>>
>>>> Wouldn't these arches have OF disabled and call an empty function?
>>>> Regardless, we still need this.
>>>>
>>>>> Signed-off-by: Murali Karicheri<m-karicheri2@ti.com>
>>>>
>>>>
>>>> I'm assuming Bjorn will apply this.
>>>>
>>>> Acked-by: Rob Herring<robh@kernel.org>
>>>
>>>
>>> It might be an idea to read the subject line...
>>>
>>> "fix BUG: unable to handle kernel"
>>
>> Russell,
>>
>> I will fix the subject as "fix BUG: unable to handle kernel NULL pointer"
>> and re-send.
>
> Russell's point is the subject applies to every fix for a BUG.
> Something like "of/pci: fix of_pci_dma_configure parent ptr NULL
> dereference".
Ok. Got it.
>
> Rob


-- 
Murali Karicheri
Linux Kernel, Texas Instruments