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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-03-21 02:57:57 +0300
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-03-21 02:57:57 +0300
commit90407c9976939e061f32b0e07602e5ce4887d9e8 (patch)
tree9e962cdc2f11687751c8d37d74dad1abcd88e5e9 /arch
parenta952baa034ae7c2e4a66932005cbc7ebbccfe28d (diff)
downloadlinux-90407c9976939e061f32b0e07602e5ce4887d9e8.tar.xz
powerpc/pci: Fix crash in PCI code on ppc64 when matching device nodes
Commit b5d937de0367d26f65b9af1aef5f2c34c1939be0 has a bug which causes basically a NULL dereference in the PCI code during boot on ppc64 machines. fetch_dev_dn() is called when dev->dev.of_node is NULL, so using that as the starting point for the search makes no sense. It should instead start from the device node of the PHB. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/pci_dn.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index 29852688ceaa..d225d99fe39d 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -176,11 +176,14 @@ static void *is_devfn_node(struct device_node *dn, void *data)
*/
struct device_node *fetch_dev_dn(struct pci_dev *dev)
{
- struct device_node *orig_dn = dev->dev.of_node;
+ struct pci_controller *phb = dev->sysdata;
struct device_node *dn;
unsigned long searchval = (dev->bus->number << 8) | dev->devfn;
- dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval);
+ if (WARN_ON(!phb))
+ return NULL;
+
+ dn = traverse_pci_devices(phb->dn, is_devfn_node, (void *)searchval);
if (dn)
dev->dev.of_node = dn;
return dn;