Re: [PATCH v1] of/pci : fix of_pci_dma_configure parent ptr NULL

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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@xxxxxx>
Acked-by: Rob Herring<robh@xxxxxxxxxx>
---
  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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