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

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Date:	Thu, 12 Mar 2015 11:03:45 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Murali Karicheri <m-karicheri2@...com>, <bhelgaas@...gle.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 03/11/2015 12:40 PM, 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>
> ---
>   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);
>   }

BJorn,

Just wondering if you can apply this to pci/iommu to help provide enough 
baking time for this series to make into next kernel merge window.

As always, thanks for all your help.

Regards,
-- 
Murali Karicheri
Linux Kernel, Texas Instruments
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