linux-kernel - Re: [PATCH] pci: of : fix BUG: unable to handle kernel

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Date:	Wed, 11 Mar 2015 07:35:45 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Arnd Bergmann <arnd@...db.de>,
	Suravee Suthikulanit <Suravee.Suthikulpanit@....com>,
	Will Deacon <will.deacon@....com>,
	Joerg Roedel <joro@...tes.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH] pci: of : fix BUG: unable to handle kernel

On Tue, Mar 10, 2015 at 10:25 AM, Murali Karicheri <m-karicheri2@...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@...com>

I'm assuming Bjorn will apply this.

Acked-by: Rob Herring <robh@...nel.org>

> ---
>  drivers/of/of_pci.c |    4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> index 86d3c38..a8e485c 100644
> --- a/drivers/of/of_pci.c
> +++ b/drivers/of/of_pci.c
> @@ -129,6 +129,10 @@ void of_pci_dma_configure(struct pci_dev *pci_dev)
>         struct device *dev = &pci_dev->dev;
>         struct device *bridge = pci_get_host_bridge_device(pci_dev);
>
> +       /* Some platforms can have bridge->parent set to NULL */
> +       if (!bridge->parent)
> +               return;
> +
>         of_dma_configure(dev, bridge->parent->of_node);
>         pci_put_host_bridge_device(bridge);
>  }
> --
> 1.7.9.5
>
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