linux-kernel - [PATCH 6/7] cpufreq_stats: do not remove sysfs files if frequency table is not present

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Message-Id: <1360088646-19104-7-git-send-email-dirk.brandewie@gmail.com>
Date:	Tue,  5 Feb 2013 10:24:05 -0800
From:	dirk.brandewie@...il.com
To:	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org
Cc:	Dirk Brandewie <dirk.brandewie@...il.com>,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: [PATCH 6/7] cpufreq_stats: do not remove sysfs files if frequency table is not present

From: Dirk Brandewie <dirk.brandewie@...il.com>

The sysfs files for cpufreq_stats are created in cpufreq_stats_create_table()
called from cpufreq_stat_notifier_policy() when a policy is added to
the cpu. cpufreq_stats_create_table() will not be called if the
scaling driver does not export a frequency table to cpufreq.  Use the
same fence on tear down.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com>
---
 drivers/cpufreq/cpufreq_stats.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 572124c..fb001e2 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -185,6 +185,11 @@ static void cpufreq_stats_free_table(unsigned int cpu)
 static void cpufreq_stats_free_sysfs(unsigned int cpu)
 {
 	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+	struct cpufreq_frequency_table *table;
+
+	table = cpufreq_frequency_get_table(cpu);
+	if (!table)
+		return;
 	if (policy && !policy_is_shared(policy)) {
 		pr_debug("%s: Free sysfs stat\n", __func__);
 		sysfs_remove_group(&policy->kobj, &stats_attr_group);
-- 
1.7.7.6

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