linux-kernel - [PATCH 1/2] topology: Check for missing CPU devices

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Date:	Sun, 08 Jan 2012 20:48:34 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Thorsten Glaser <tg@...bsd.de>,
	Debian kernel team <debian-kernel@...ts.debian.org>,
	linux-m68k@...r.kernel.org, debian-68k@...ts.debian.org
Subject: [PATCH 1/2] topology: Check for missing CPU devices

Commit ccbc60d3e19a1b6ae66ca0d89b3da02dde62088b ('topology: Provide
CPU topology in sysfs in !SMP configurations') causes a crash at boot
on a several architectures.  The topology sysfs code assumes that
there is a CPU device for each online CPU whereas some architectures
that do not support SMP or cpufreq do not register any CPU devices.
Check for this before trying to use a device.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/base/topology.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index ae989c5..4467c85 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -147,6 +147,8 @@ static int __cpuinit topology_add_dev(unsigned int cpu)
 {
 	struct device *dev = get_cpu_device(cpu);
 
+	if (!dev)
+		return -ENODEV;
 	return sysfs_create_group(&dev->kobj, &topology_attr_group);
 }
 
@@ -154,7 +156,8 @@ static void __cpuinit topology_remove_dev(unsigned int cpu)
 {
 	struct device *dev = get_cpu_device(cpu);
 
-	sysfs_remove_group(&dev->kobj, &topology_attr_group);
+	if (dev)
+		sysfs_remove_group(&dev->kobj, &topology_attr_group);
 }
 
 static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
-- 
1.7.8.2



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