2.4.20-rc1: oops in drivers/acpi/namespace/nswalk.c (with patch)

[H. Peter Anvin]

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I have one machine which has been reliably oopsing in 
drivers/acpi/namespace/nswalk.c -- this patch makes it work, but I have 
no idea why.  Either way, I thought someone would probably want to look 
at it.

	-hpa

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--- drivers/acpi/namespace/nswalk.c~	Wed Oct 24 14:06:22 2001
+++ drivers/acpi/namespace/nswalk.c	Wed Nov  6 21:13:37 2002
@@ -63,6 +63,8 @@
 
 	FUNCTION_ENTRY ();
 
+	if (!parent_node)
+		return NULL;	/* Uhm... */
 
 	if (!child_node) {
 		/* It's really the parent's _scope_ that we want */

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