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cpufreq: Perform light-weight init/teardown during suspend/resume 

Now that we have the infrastructure to perform a light-weight init/tear-down,
use that in the cpufreq CPU hotplug notifier when invoked from the
suspend/resume path.

This also ensures that the file permissions of the cpufreq sysfs files are
preserved across suspend/resume, something which commit a66b2e (cpufreq:
Preserve sysfs files across suspend/resume) originally intended to do, but
had to be reverted due to other problems.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Srivatsa S. Bhat 2013-07-30 04:25:25 +05:30 committed by Rafael J. Wysocki
parent 8414809c6a
commit 5302c3fb2e
2 changed files with 11 additions and 9 deletions
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18
drivers/cpufreq/cpufreq.c
View File

@ -2040,22 +2040,26 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb,
{
unsigned int cpu = (unsigned long)hcpu;
struct device *dev;
bool frozen = false;
dev = get_cpu_device(cpu);
if (dev) {
switch (action) {
if (action & CPU_TASKS_FROZEN)
frozen = true;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
cpufreq_add_dev(dev, NULL);
__cpufreq_add_dev(dev, NULL, frozen);
cpufreq_update_policy(cpu);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
__cpufreq_remove_dev(dev, NULL, false);
__cpufreq_remove_dev(dev, NULL, frozen);
break;
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
cpufreq_add_dev(dev, NULL);
__cpufreq_add_dev(dev, NULL, frozen);
break;
}
}

2
drivers/cpufreq/cpufreq_stats.c
View File

@ -349,11 +349,9 @@ static int cpufreq_stat_cpu_callback(struct notifier_block *nfb,
switch (action) {
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
cpufreq_stats_free_sysfs(cpu);
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
cpufreq_stats_free_table(cpu);
break;
}