linux-kernel - [PATCH 4.6 044/203] thermal: cpu_cooling: fix improper order during initialization

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Date:	Mon, 25 Jul 2016 13:54:19 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Lukasz Luba <lukasz.luba@....com>,
	Javi Merino <javi.merino@....com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>
Subject: [PATCH 4.6 044/203] thermal: cpu_cooling: fix improper order during initialization

4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lukasz Luba <lukasz.luba@....com>

commit f840ab18bdf2e415dac21d09fbbbd2873111bd48 upstream.

The freq_table array is not populated before calling
thermal_of_cooling_register. The code which populates the freq table was
introduced in commit f6859014.
This should be done before registering new thermal cooling device.
The log shows effects of this wrong decision.
[    2.172614] cpu cpu1: Failed to get voltage for frequency 1984518656000: -34
[    2.220863] cpu cpu0: Failed to get voltage for frequency 1984524416000: -34

Fixes: f6859014c7e7 ("thermal: cpu_cooling: Store frequencies in descending order")
Signed-off-by: Lukasz Luba <lukasz.luba@....com>
Acked-by: Javi Merino <javi.merino@....com>
Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/thermal/cpu_cooling.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -857,14 +857,6 @@ __cpufreq_cooling_register(struct device
 		goto free_power_table;
 	}
 
-	snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
-		 cpufreq_dev->id);
-
-	cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev,
-						      &cpufreq_cooling_ops);
-	if (IS_ERR(cool_dev))
-		goto remove_idr;
-
 	/* Fill freq-table in descending order of frequencies */
 	for (i = 0, freq = -1; i <= cpufreq_dev->max_level; i++) {
 		freq = find_next_max(table, freq);
@@ -877,6 +869,14 @@ __cpufreq_cooling_register(struct device
 			pr_debug("%s: freq:%u KHz\n", __func__, freq);
 	}
 
+	snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
+		 cpufreq_dev->id);
+
+	cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev,
+						      &cpufreq_cooling_ops);
+	if (IS_ERR(cool_dev))
+		goto remove_idr;
+
 	cpufreq_dev->clipped_freq = cpufreq_dev->freq_table[0];
 	cpufreq_dev->cool_dev = cool_dev;