From mboxrd@z Thu Jan 1 00:00:00 1970 From: Juri Lelli Subject: [RFC PATCH 10/19] cpufreq: assert policy->rwsem is held in cpufreq_set_policy Date: Mon, 11 Jan 2016 17:35:51 +0000 Message-ID: <1452533760-13787-11-git-send-email-juri.lelli@arm.com> References: <1452533760-13787-1-git-send-email-juri.lelli@arm.com> Return-path: In-Reply-To: <1452533760-13787-1-git-send-email-juri.lelli@arm.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org, peterz@infradead.org, rjw@rjwysocki.net, viresh.kumar@linaro.org, mturquette@baylibre.com, steve.muckle@linaro.org, vincent.guittot@linaro.org, morten.rasmussen@arm.com, dietmar.eggemann@arm.com, juri.lelli@arm.com List-Id: linux-pm@vger.kernel.org Since cpufreq_set_policy is modifying policy, it has to work under policy-> rwsem protection. Assert such condition. Cc: "Rafael J. Wysocki" Cc: Viresh Kumar Signed-off-by: Juri Lelli --- 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