From: Prarit Bhargava <prarit@redhat.com>
Date: Mon, 3 Aug 2009 14:58:11 +0000 (-0400)
Subject: [CPUFREQ] Do not set policy for offline cpus
X-Git-Tag: v2.6.31-rc6~80^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=42c74b84c64633dd3badbfc2abd2ef1728b64b30;p=thirdparty%2Fkernel%2Flinux.git

[CPUFREQ] Do not set policy for offline cpus

Suspend/Resume fails on multi socket, multi core systems because the cpufreq
code erroneously sets the per_cpu policy_cpu value when a logical cpu is
offline.

This most notably results in missing sysfs files that are used to set the
cpu frequencies of the various cpus.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Dave Jones <davej@redhat.com>
---

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index b90eda8b34409..120d236c0ffb2 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -924,6 +924,8 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 
 	spin_lock_irqsave(&cpufreq_driver_lock, flags);
 	for_each_cpu(j, policy->cpus) {
+		if (!cpu_online(j))
+			continue;
 		per_cpu(cpufreq_cpu_data, j) = policy;
 		per_cpu(policy_cpu, j) = policy->cpu;
 	}