linux-kernel - [RFC PATCH 10/19] cpufreq: assert policy->rwsem is held in cpufreq_set

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Date:	Mon, 11 Jan 2016 17:35:51 +0000
From:	Juri Lelli <juri.lelli@....com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pm@...r.kernel.org, peterz@...radead.org, rjw@...ysocki.net,
	viresh.kumar@...aro.org, mturquette@...libre.com,
	steve.muckle@...aro.org, vincent.guittot@...aro.org,
	morten.rasmussen@....com, dietmar.eggemann@....com,
	juri.lelli@....com
Subject: [RFC PATCH 10/19] cpufreq: assert policy->rwsem is held in cpufreq_set_policy

Since cpufreq_set_policy is modifying policy, it has to work under policy->
rwsem protection.

Assert such condition.

Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Juri Lelli <juri.lelli@....com>
---
 drivers/cpufreq/cpufreq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index d91fdb8..f1f9fbc 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2109,6 +2109,8 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
 	pr_debug("setting new policy for CPU %u: %u - %u kHz\n",
 		 new_policy->cpu, new_policy->min, new_policy->max);
 
+	lockdep_assert_held(&policy->rwsem);
+
 	memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo));
 
 	/*
-- 
2.2.2