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cpufreq: governor: Avoid passing dbs_data pointers around unnecessarily

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Do not pass struct dbs_data pointers to the family of functions
implementing governor operations in cpufreq_governor.c as they can
take that pointer from policy->governor by themselves.

The cpufreq_governor_init() case is slightly more complicated, since
policy->governor may be NULL when it is invoked, but then it can reach
the pointer in question via its cdata argument just fine.

While at it, rework cpufreq_governor_dbs() to avoid a pointless
policy_governor check in the CPUFREQ_GOV_POLICY_INIT case.

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 2016-02-05 03:15:24 +01:00
parent 2bb8d94fb0
commit 5da3dd1e00
1 changed files with 27 additions and 41 deletions
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68
drivers/cpufreq/cpufreq_governor.c
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@ -329,9 +329,9 @@ static void free_common_dbs_info(struct cpufreq_policy *policy,
}
static int cpufreq_governor_init(struct cpufreq_policy *policy,
struct dbs_data *dbs_data,
struct common_dbs_data *cdata)
{
struct dbs_data *dbs_data = cdata->gdbs_data;
unsigned int latency;
int ret;
@ -403,9 +403,9 @@ free_dbs_data:
return ret;
}
static int cpufreq_governor_exit(struct cpufreq_policy *policy,
struct dbs_data *dbs_data)
static int cpufreq_governor_exit(struct cpufreq_policy *policy)
{
struct dbs_data *dbs_data = policy->governor_data;
struct common_dbs_data *cdata = dbs_data->cdata;
struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(policy->cpu);
@ -432,9 +432,9 @@ static int cpufreq_governor_exit(struct cpufreq_policy *policy,
return 0;
}
static int cpufreq_governor_start(struct cpufreq_policy *policy,
struct dbs_data *dbs_data)
static int cpufreq_governor_start(struct cpufreq_policy *policy)
{
struct dbs_data *dbs_data = policy->governor_data;
struct common_dbs_data *cdata = dbs_data->cdata;
unsigned int sampling_rate, ignore_nice, j, cpu = policy->cpu;
struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu);
@ -499,9 +499,9 @@ static int cpufreq_governor_start(struct cpufreq_policy *policy,
return 0;
}
static int cpufreq_governor_stop(struct cpufreq_policy *policy,
struct dbs_data *dbs_data)
static int cpufreq_governor_stop(struct cpufreq_policy *policy)
{
struct dbs_data *dbs_data = policy->governor_data;
struct cpu_dbs_info *cdbs = dbs_data->cdata->get_cpu_cdbs(policy->cpu);
struct cpu_common_dbs_info *shared = cdbs->shared;
@ -515,9 +515,9 @@ static int cpufreq_governor_stop(struct cpufreq_policy *policy,
return 0;
}
static int cpufreq_governor_limits(struct cpufreq_policy *policy,
struct dbs_data *dbs_data)
static int cpufreq_governor_limits(struct cpufreq_policy *policy)
{
struct dbs_data *dbs_data = policy->governor_data;
struct common_dbs_data *cdata = dbs_data->cdata;
unsigned int cpu = policy->cpu;
struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu);
@ -542,45 +542,31 @@ static int cpufreq_governor_limits(struct cpufreq_policy *policy,
int cpufreq_governor_dbs(struct cpufreq_policy *policy,
struct common_dbs_data *cdata, unsigned int event)
{
struct dbs_data *dbs_data;
int ret;
int ret = -EINVAL;
/* Lock governor to block concurrent initialization of governor */
mutex_lock(&dbs_data_mutex);
if (have_governor_per_policy())
dbs_data = policy->governor_data;
else
dbs_data = cdata->gdbs_data;
if (!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT)) {
ret = -EINVAL;
goto unlock;
if (event == CPUFREQ_GOV_POLICY_INIT) {
ret = cpufreq_governor_init(policy, cdata);
} else if (policy->governor_data) {
switch (event) {
case CPUFREQ_GOV_POLICY_EXIT:
ret = cpufreq_governor_exit(policy);
break;
case CPUFREQ_GOV_START:
ret = cpufreq_governor_start(policy);
break;
case CPUFREQ_GOV_STOP:
ret = cpufreq_governor_stop(policy);
break;
case CPUFREQ_GOV_LIMITS:
ret = cpufreq_governor_limits(policy);
break;
}
}
switch (event) {
case CPUFREQ_GOV_POLICY_INIT:
ret = cpufreq_governor_init(policy, dbs_data, cdata);
break;
case CPUFREQ_GOV_POLICY_EXIT:
ret = cpufreq_governor_exit(policy, dbs_data);
break;
case CPUFREQ_GOV_START:
ret = cpufreq_governor_start(policy, dbs_data);
break;
case CPUFREQ_GOV_STOP:
ret = cpufreq_governor_stop(policy, dbs_data);
break;
case CPUFREQ_GOV_LIMITS:
ret = cpufreq_governor_limits(policy, dbs_data);
break;
default:
ret = -EINVAL;
}
unlock:
mutex_unlock(&dbs_data_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_governor_dbs);