[POWERPC] Extra sanity check in EEH code

Don't dereference a device node that isn't there.  A "shouldn't
happen" case, but someone ran into it with a possibly misconfigured
device tree.

Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh_cache.c b/arch/powerpc/platforms/pseries/eeh_cache.c
index d4a402c5866c..98c23aec85be 100644
--- a/arch/powerpc/platforms/pseries/eeh_cache.c
+++ b/arch/powerpc/platforms/pseries/eeh_cache.c
@@ -304,6 +304,8 @@ void __init pci_addr_cache_build(void)
                 pci_addr_cache_insert_device(dev);
 
                 dn = pci_device_to_OF_node(dev);
+                if (!dn)
+                        continue;
                 pci_dev_get (dev);  /* matching put is in eeh_remove_device() */
                 PCI_DN(dn)->pcidev = dev;
         }