Commit 8ead819f authored by chenqiwu's avatar chenqiwu Committed by Viresh Kumar
Browse files

cpufreq: s3c: fix unbalances of cpufreq policy refcount 



The cpufreq_reboot_notifier_evt() call cpufreq_cpu_get() to get the
cpufreq policy of cpu0, meanwhile, it also increments the kobject
reference count to mark it busy. However, a corresponding call of
cpufreq_cpu_put() is ignored to decrement the kobject reference count
back, which may lead to a potential stuck risk that the cpuhp thread
deadly waits for dropping of kobject refcount when cpufreq policy free.

With this patch, the cpuhp thread can be easily exercised by attempting
to force an unbind of the CPUfreq driver.

Signed-off-by: default avatarchenqiwu <chenqiwu@xiaomi.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent 83fe39ad

drivers/cpufreq/s3c2416-cpufreq.c

+11 −1
Original line number Diff line number Diff line
@@ -304,6 +304,7 @@ static int s3c2416_cpufreq_reboot_notifier_evt(struct notifier_block *this, 
{

	struct s3c2416_data *s3c_freq = &s3c2416_cpufreq;

	int ret;

	struct cpufreq_policy *policy;



	mutex_lock(&cpufreq_lock);
@@ -318,7 +319,16 @@ static int s3c2416_cpufreq_reboot_notifier_evt(struct notifier_block *this, 
	 */

	if (s3c_freq->is_dvs) {

		pr_debug("cpufreq: leave dvs on reboot\n");

		ret = cpufreq_driver_target(cpufreq_cpu_get(0), FREQ_SLEEP, 0);



		policy = cpufreq_cpu_get(0);

		if (!policy) {

			pr_debug("cpufreq: get no policy for cpu0\n");

			return NOTIFY_BAD;

		}



		ret = cpufreq_driver_target(policy, FREQ_SLEEP, 0);

		cpufreq_cpu_put(policy);



		if (ret < 0)

			return NOTIFY_BAD;

	}

drivers/cpufreq/s5pv210-cpufreq.c

+10 −1
Original line number Diff line number Diff line
@@ -555,8 +555,17 @@ static int s5pv210_cpufreq_reboot_notifier_event(struct notifier_block *this, 
						 unsigned long event, void *ptr)

{

	int ret;

	struct cpufreq_policy *policy;



	policy = cpufreq_cpu_get(0);

	if (!policy) {

		pr_debug("cpufreq: get no policy for cpu0\n");

		return NOTIFY_BAD;

	}



	ret = cpufreq_driver_target(policy, SLEEP_FREQ, 0);

	cpufreq_cpu_put(policy);



	ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ, 0);

	if (ret < 0)

		return NOTIFY_BAD;

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