From: Olaf Hering <olaf@aepfle.de>
Date: Mon, 17 Mar 2008 19:53:05 +0000 (+1100)
Subject: [POWERPC] Fix crash in init_ipic_sysfs on efika
X-Git-Tag: v2.6.25-rc7~23^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1428a9fa586cb80acf98289f797f58b8bd662598;p=platform%2Fkernel%2Flinux-exynos.git

[POWERPC] Fix crash in init_ipic_sysfs on efika

The global primary_ipic in arch/powerpc/sysdev/ipic.c can remain NULL
if ipic_init() fails, which will happen on machines that don't have an
ipic interrupt controller.  init_ipic_sysfs() will crash in that case.

Acked-by: Grant Likely <grant.likely@secretlab.ca>

Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/sysdev/ipic.c b/arch/powerpc/sysdev/ipic.c
index ae0dbf4..0f2dfb0 100644
--- a/arch/powerpc/sysdev/ipic.c
+++ b/arch/powerpc/sysdev/ipic.c
@@ -906,7 +906,7 @@ static int __init init_ipic_sysfs(void)
 {
 	int rc;
 
-	if (!primary_ipic->regs)
+	if (!primary_ipic || !primary_ipic->regs)
 		return -ENODEV;
 	printk(KERN_DEBUG "Registering ipic with sysfs...\n");