linux-kernel - [PATCH 4/5] cpufreq: don't update policy->cpu while removing while removing other CPUs

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Date:	Thu, 12 Sep 2013 10:55:47 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...k.pl, swarren@...dotorg.org,
	srivatsa.bhat@...ux.vnet.ibm.com
Cc:	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH 4/5] cpufreq: don't update policy->cpu while removing while removing other CPUs

With a recent change the logic here is changed a bit and I just figured out it
is something we don't want.

Consider we have four CPUs (0,1,2,3) managed by a policy and policy->cpu is set
to 0. Now we are suspending and hence we call __cpufreq_remove_dev_prepare() for
cpu 1, 2 & 3..

With the current code we always call cpufreq_nominate_new_policy_cpu() for cpu
1, 2 & 3 whereas we should skipped most of __cpufreq_remove_dev_prepare()
routine.

Lets fix it by moving the check for !frozen inside the first if block.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/cpufreq.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 5e0a82e..0e11fcb 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1182,8 +1182,9 @@ static int __cpufreq_remove_dev_prepare(struct device *dev,
 		cpumask_clear_cpu(cpu, policy->cpus);
 	unlock_policy_rwsem_write(cpu);
 
-	if (cpu != policy->cpu && !frozen) {
-		sysfs_remove_link(&dev->kobj, "cpufreq");
+	if (cpu != policy->cpu) {
+		if (!frozen)
+			sysfs_remove_link(&dev->kobj, "cpufreq");
 	} else if (cpus > 1) {
 		new_cpu = cpufreq_nominate_new_policy_cpu(policy, cpu, frozen);
 		if (new_cpu >= 0) {
-- 
1.7.12.rc2.18.g61b472e

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