linux-kernel - [PATCH 6/7] powerpc/crashdump: Do not fail on NULL pointer dereferencing

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Message-ID: <20110307115425.GH8194@linux.vnet.ibm.com>
Date:	Mon, 7 Mar 2011 17:24:25 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	stable@...nel.org
Cc:	linux-kernel@...r.kernel.org, greg@...ah.com, anton@...ba.org,
	benh@...nel.crashing.org
Subject: [PATCH 6/7] powerpc/crashdump: Do not fail on NULL pointer
	dereferencing

    powerpc/crashdump: Do not fail on NULL pointer dereferencing

    Commit: 426b6cb478e60352a463a0d1ec75c1c9fab30b13 upstream

    Signed-off-by: Maxim Uvarov <muvarov@...il.com>
    Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
    Signed-off-by: Kamalesh babulal <kamalesh@...ux.vnet.ibm.com>
    cc: Anton Blanchard <anton@...ba.org>
---
 arch/powerpc/kernel/crash.c |    3 +++
 1 file changed, 3 insertions(+)

Index: b/arch/powerpc/kernel/crash.c
===================================================================
--- a/arch/powerpc/kernel/crash.c	2011-03-07 00:59:25.108253005 -0800
+++ b/arch/powerpc/kernel/crash.c	2011-03-07 01:01:07.004296733 -0800
@@ -378,6 +378,9 @@
	for_each_irq(i) {
		struct irq_desc *desc = irq_desc + i;

+		if (!desc || !desc->chip || !desc->chip->eoi)
+			continue;
+
		if (desc->status & IRQ_INPROGRESS)
			desc->chip->eoi(i);

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