linux-kernel - [PATCH 16/17] thermal: cpu_cooling: 'freq' can't be zero in cpufreq

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Message-Id: <252aef1977bab800768c5144e907f8d0696323a9.1489640000.git.viresh.kumar@linaro.org>
Date:   Thu, 16 Mar 2017 10:59:51 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rafael Wysocki <rjw@...ysocki.net>,
        Javi Merino <javi.merino@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 16/17] thermal: cpu_cooling: 'freq' can't be zero in cpufreq_state2power()

The frequency table shouldn't have any zero frequency entries and so
such a check isn't required. Though it would be better to make sure
'state' is within limits.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/thermal/cpu_cooling.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index fb535fd5aa12..768a95bcc392 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -561,12 +561,13 @@ static int cpufreq_state2power(struct thermal_cooling_device *cdev,
 	int ret;
 	struct cpufreq_cooling_device *cpufreq_dev = cdev->devdata;
 
+	/* Request state should be less than max_level */
+	if (WARN_ON(state > cpufreq_dev->max_level))
+		return -EINVAL;
+
 	num_cpus = cpumask_weight(cpufreq_dev->policy->cpus);
 
 	freq = cpufreq_dev->freq_table[state].frequency;
-	if (!freq)
-		return -EINVAL;
-
 	dynamic_power = cpu_freq_to_power(cpufreq_dev, freq) * num_cpus;
 	ret = get_static_power(cpufreq_dev, tz, freq, &static_power);
 	if (ret)
-- 
2.7.1.410.g6faf27b