[PATCH 4.4 028/146] thermal: cpu_cooling: fix improper order during initialization

Greg Kroah-Hartman
2016-07-25T21:05:05Z

From: Lukasz Luba <lukasz.luba@arm.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@arm.com>
Acked-by: Javi Merino <javi.merino@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;