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

From: Murali Karicheri
Date: Wed Mar 11 2015 - 12:40:37 EST

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);

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