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cpufreq: Remove 'policy->governor_enabled'

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The entire sequence of events (like INIT/START or STOP/EXIT) for which
cpufreq_governor() is called, is guaranteed to be protected by
policy->rwsem now.

The additional checks that were added earlier (as we were forced to drop
policy->rwsem before calling cpufreq_governor() for EXIT event), aren't
required anymore.

Over that, they weren't sufficient really. They just take care of
START/STOP events, but not INIT/EXIT and the state machine was never
maintained properly by them.

Kill the unnecessary checks and policy->governor_enabled field.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2016-02-22 16:36:44 +05:30 committed by Rafael J. Wysocki
parent a1317e091a
commit 242aa883a6
2 changed files with 0 additions and 18 deletions
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17
drivers/cpufreq/cpufreq.c
View File

@ -2010,17 +2010,6 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
pr_debug("%s: for CPU %u, event %u\n", __func__, policy->cpu, event);
if ((policy->governor_enabled && event == CPUFREQ_GOV_START)
|| (!policy->governor_enabled
&& (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) {
return -EBUSY;
}
if (event == CPUFREQ_GOV_STOP)
policy->governor_enabled = false;
else if (event == CPUFREQ_GOV_START)
policy->governor_enabled = true;
ret = policy->governor->governor(policy, event);
if (!ret) {
@ -2028,12 +2017,6 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
policy->governor->initialized++;
else if (event == CPUFREQ_GOV_POLICY_EXIT)
policy->governor->initialized--;
} else {
/* Restore original values */
if (event == CPUFREQ_GOV_STOP)
policy->governor_enabled = true;
else if (event == CPUFREQ_GOV_START)
policy->governor_enabled = false;
}
if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) ||

1
include/linux/cpufreq.h
View File

@ -80,7 +80,6 @@ struct cpufreq_policy {
unsigned int last_policy; /* policy before unplug */
struct cpufreq_governor *governor; /* see below */
void *governor_data;
bool governor_enabled; /* governor start/stop flag */
char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
struct work_struct update; /* if update_policy() needs to be