linux-kernel - Re: [PATCH v1] of/pci : fix of_pci_dma

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Message-ID: <20150319150134.GA26935@google.com>
Date:	Thu, 19 Mar 2015 10:01:34 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	grant.likely@...aro.org, robh+dt@...nel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, arnd@...db.de,
	Suravee.Suthikulpanit@....com, will.deacon@....com,
	joro@...tes.org, linux@....linux.org.uk
Subject: Re: [PATCH v1] of/pci : fix of_pci_dma_configure parent ptr NULL

On Wed, Mar 11, 2015 at 12:40:03PM -0400, Murali Karicheri 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()
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> Acked-by: Rob Herring<robh@...nel.org>

Since I hadn't merged the original patch yet, I just folded this fix into
it.  The series is on pci/iommu, and I merged it for "next".  Thanks for
your patience. 

Bjorn

> ---
>  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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