[RFC PATCH 11/19] cpufreq: assert policy->rwsem is held in __cpufreq_governor

From	Juri Lelli <juri.lelli@arm.com>
Newsgroups	linux.kernel
Subject	[RFC PATCH 11/19] cpufreq: assert policy->rwsem is held in __cpufreq_governor
Date	2016-01-11 18:50 +0100
Message-ID	<qPOLo-5E8-5@gated-at.bofh.it> (permalink)
References	<qPOBH-5zs-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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__cpufreq_governor works on policy, so policy->rwsem has to be held.
Add assertion for such condition.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
---
 drivers/cpufreq/cpufreq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index f1f9fbc..e7fc5c9 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1950,6 +1950,9 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
 	/* Don't start any governor operations if we are entering suspend */
 	if (cpufreq_suspended)
 		return 0;
+
+	lockdep_assert_held(&policy->rwsem);
+
 	/*
 	 * Governor might not be initiated here if ACPI _PPC changed
 	 * notification happened, so check it.
-- 
2.2.2

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[RFC PATCH 11/19] cpufreq: assert policy->rwsem is held in __cpufreq_governor Juri Lelli <juri.lelli@arm.com> - 2016-01-11 18:50 +0100
  Re: [RFC PATCH 11/19] cpufreq: assert policy->rwsem is held in  __cpufreq_governor Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-12 11:30 +0100

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