Commit 89970a04 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

Pull thermal management fixes from Zhang Rui:

 - Fix a potential deadlock in cpu_cooling driver, which was introduced
   in 4.11-rc1. (Matthew Wilcox)

 - Fix the cpu_cooling and devfreq_cooling code to handle possible error
   return value from OPP calls, together with three minor fixes in the
   same patch series. (Viresh Kumar)

* 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux:
  thermal: cpu_cooling: Check OPP for errors
  thermal: cpu_cooling: Replace dev_warn with dev_err
  thermal: devfreq: Check OPP for errors
  thermal: devfreq_cooling: Replace dev_warn with dev_err
  thermal: devfreq: Simplify expression
  thermal: Fix potential deadlock in cpu_cooling
parents 806276b7 3ea3217c
......@@ -107,8 +107,6 @@ struct cpufreq_cooling_device {
};
static DEFINE_IDA(cpufreq_ida);
static unsigned int cpufreq_dev_count;
static DEFINE_MUTEX(cooling_list_lock);
static LIST_HEAD(cpufreq_dev_list);
......@@ -395,13 +393,20 @@ static int get_static_power(struct cpufreq_cooling_device *cpufreq_device,
opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz,
true);
if (IS_ERR(opp)) {
dev_warn_ratelimited(cpufreq_device->cpu_dev,
"Failed to find OPP for frequency %lu: %ld\n",
freq_hz, PTR_ERR(opp));
return -EINVAL;
}
voltage = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(cpufreq_device->cpu_dev,
"Failed to get voltage for frequency %lu: %ld\n",
freq_hz, IS_ERR(opp) ? PTR_ERR(opp) : 0);
dev_err_ratelimited(cpufreq_device->cpu_dev,
"Failed to get voltage for frequency %lu\n",
freq_hz);
return -EINVAL;
}
......@@ -693,9 +698,9 @@ static int cpufreq_power2state(struct thermal_cooling_device *cdev,
*state = cpufreq_cooling_get_level(cpu, target_freq);
if (*state == THERMAL_CSTATE_INVALID) {
dev_warn_ratelimited(&cdev->device,
"Failed to convert %dKHz for cpu %d into a cdev state\n",
target_freq, cpu);
dev_err_ratelimited(&cdev->device,
"Failed to convert %dKHz for cpu %d into a cdev state\n",
target_freq, cpu);
return -EINVAL;
}
......@@ -771,6 +776,7 @@ __cpufreq_cooling_register(struct device_node *np,
unsigned int freq, i, num_cpus;
int ret;
struct thermal_cooling_device_ops *cooling_ops;
bool first;
if (!alloc_cpumask_var(&temp_mask, GFP_KERNEL))
return ERR_PTR(-ENOMEM);
......@@ -874,13 +880,14 @@ __cpufreq_cooling_register(struct device_node *np,
cpufreq_dev->cool_dev = cool_dev;
mutex_lock(&cooling_list_lock);
/* Register the notifier for first cpufreq cooling device */
first = list_empty(&cpufreq_dev_list);
list_add(&cpufreq_dev->node, &cpufreq_dev_list);
mutex_unlock(&cooling_list_lock);
/* Register the notifier for first cpufreq cooling device */
if (!cpufreq_dev_count++)
if (first)
cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
mutex_unlock(&cooling_list_lock);
goto put_policy;
......@@ -1021,6 +1028,7 @@ EXPORT_SYMBOL(of_cpufreq_power_cooling_register);
void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
{
struct cpufreq_cooling_device *cpufreq_dev;
bool last;
if (!cdev)
return;
......@@ -1028,14 +1036,15 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
cpufreq_dev = cdev->devdata;
mutex_lock(&cooling_list_lock);
list_del(&cpufreq_dev->node);
/* Unregister the notifier for the last cpufreq cooling device */
if (!--cpufreq_dev_count)
last = list_empty(&cpufreq_dev_list);
mutex_unlock(&cooling_list_lock);
if (last)
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
list_del(&cpufreq_dev->node);
mutex_unlock(&cooling_list_lock);
thermal_cooling_device_unregister(cpufreq_dev->cool_dev);
ida_simple_remove(&cpufreq_ida, cpufreq_dev->id);
kfree(cpufreq_dev->dyn_power_table);
......
......@@ -186,16 +186,22 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
return 0;
opp = dev_pm_opp_find_freq_exact(dev, freq, true);
if (IS_ERR(opp) && (PTR_ERR(opp) == -ERANGE))
if (PTR_ERR(opp) == -ERANGE)
opp = dev_pm_opp_find_freq_exact(dev, freq, false);
if (IS_ERR(opp)) {
dev_err_ratelimited(dev, "Failed to find OPP for frequency %lu: %ld\n",
freq, PTR_ERR(opp));
return 0;
}
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(dev,
"Failed to get voltage for frequency %lu: %ld\n",
freq, IS_ERR(opp) ? PTR_ERR(opp) : 0);
dev_err_ratelimited(dev,
"Failed to get voltage for frequency %lu\n",
freq);
return 0;
}
......
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