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cpufreq: governor: CPUFREQ_GOV_POLICY_EXIT never fails

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None of the cpufreq governors currently in the tree will ever fail
an invocation of the ->governor() callback with the event argument
equal to CPUFREQ_GOV_POLICY_EXIT (unless invoked with incorrect
arguments which doesn't matter anyway) and it wouldn't really
make sense to fail it, because the caller won't be able to handle
that failure in a meaningful way.

Accordingly, rearrange the code in the core to make it clear that
this call never fails.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2016-05-12 15:13:35 +02:00
parent c749c64f45
commit 36be3418eb
1 changed files with 12 additions and 23 deletions
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35
drivers/cpufreq/cpufreq.c
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@ -78,9 +78,9 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
static int cpufreq_start_governor(struct cpufreq_policy *policy);
static inline int cpufreq_exit_governor(struct cpufreq_policy *policy)
static inline void cpufreq_exit_governor(struct cpufreq_policy *policy)
{
return cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
(void)cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
}
/**
@ -1387,12 +1387,8 @@ static void cpufreq_offline(unsigned int cpu)
if (cpufreq_driver->stop_cpu)
cpufreq_driver->stop_cpu(policy);
/* If cpu is last user of policy, free policy */
if (has_target()) {
ret = cpufreq_exit_governor(policy);
if (ret)
pr_err("%s: Failed to exit governor\n", __func__);
}
if (has_target())
cpufreq_exit_governor(policy);
/*
* Perform the ->exit() even during light-weight tear-down,
@ -2049,16 +2045,15 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
ret = policy->governor->governor(policy, event);
if (!ret) {
if (event == CPUFREQ_GOV_POLICY_INIT)
if (event == CPUFREQ_GOV_POLICY_INIT) {
if (ret)
module_put(policy->governor->owner);
else
policy->governor->initialized++;
else if (event == CPUFREQ_GOV_POLICY_EXIT)
policy->governor->initialized--;
}
if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) ||
((event == CPUFREQ_GOV_POLICY_EXIT) && !ret))
} else if (event == CPUFREQ_GOV_POLICY_EXIT) {
policy->governor->initialized--;
module_put(policy->governor->owner);
}
return ret;
}
@ -2228,13 +2223,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
__func__, old_gov->name, ret);
return ret;
}
ret = cpufreq_exit_governor(policy);
if (ret) {
pr_err("%s: Failed to Exit Governor: %s (%d)\n",
__func__, old_gov->name, ret);
return ret;
}
cpufreq_exit_governor(policy);
}
/* start new governor */