[PATCH] powerpc: Extra sanity check in EEH code

From: Nathan Lynch <redacted>

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 <redacted>
Signed-off-by: Anton Blanchard <redacted>
---

Index: build/arch/powerpc/platforms/pseries/eeh_cache.c
===================================================================

--- build.orig/arch/powerpc/platforms/pseries/eeh_cache.c	2006-06-08 10:57:36.000000000 +1000
+++ build/arch/powerpc/platforms/pseries/eeh_cache.c	2006-06-20 12:01:49.000000000 +1000

@@ -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;
 	}