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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

drivers/thermal/cpu_cooling.c

+24 −15
Original line number Diff line number Diff line
@@ -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;

	}
@@ -693,7 +698,7 @@ 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,

		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);

drivers/thermal/devfreq_cooling.c

+10 −4
Original line number Diff line number Diff line
@@ -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;

	}