linux-kernel - [PATCH] cpufreq: stats: do cpufreq_cpu_put() corresponding to cpufreq_cpu

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Date:	Fri, 22 Mar 2013 15:43:52 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...k.pl
Cc:	arvind.chauhan@....com, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-kernel@...ts.linaro.org,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH] cpufreq: stats: do cpufreq_cpu_put() corresponding to cpufreq_cpu_get

In cpufreq_stats_free_sysfs() we aren't balancing calls to cpufreq_cpu_get()
with cpufreq_cpu_put(). This will never let us have ref count to policy->kobj as
zero.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/cpufreq_stats.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 2fd779e..bfd6273 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -180,15 +180,19 @@ static void cpufreq_stats_free_sysfs(unsigned int cpu)
 {
 	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
 
-	if (!cpufreq_frequency_get_table(cpu))
+	if (!policy)
 		return;
 
-	if (policy && !policy_is_shared(policy)) {
+	if (!cpufreq_frequency_get_table(cpu))
+		goto put_ref;
+
+	if (!policy_is_shared(policy)) {
 		pr_debug("%s: Free sysfs stat\n", __func__);
 		sysfs_remove_group(&policy->kobj, &stats_attr_group);
 	}
-	if (policy)
-		cpufreq_cpu_put(policy);
+
+put_ref:
+	cpufreq_cpu_put(policy);
 }
 
 static int cpufreq_stats_create_table(struct cpufreq_policy *policy,
-- 
1.7.12.rc2.18.g61b472e

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