From ffde0ef1fea2fdd6f6cef19df79ec29e8d5b77a3 Mon Sep 17 00:00:00 2001
From: Maxim Uvarov <muvarov@gmail.com>
Date: Tue, 11 May 2010 05:41:08 +0000
Subject: [PATCH] powerpc/crashdump: Do not fail on NULL pointer dereferencing

commit 426b6cb478e60352a463a0d1ec75c1c9fab30b13 upstream.

Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 arch/powerpc/kernel/crash.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index 038437621de8..cca7c8fafc1c 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -377,6 +377,9 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
 	for_each_irq(i) {
 		struct irq_desc *desc = irq_to_desc(i);
 
+		if (!desc || !desc->chip || !desc->chip->eoi)
+			continue;
+
 		if (desc->status & IRQ_INPROGRESS)
 			desc->chip->eoi(i);
 
-- 
2.39.5