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cpufreq: make return type of lock_policy_rwsem_{read|write}() as void

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lock_policy_rwsem_{read|write}() currently has return type of int,
but it always returns zero and hence its return type should be void
instead. This patch makes that change and modifies all of the users
accordingly.

Reported-by: Jon Medhurst<tixy@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2013-10-02 14:13:09 +05:30 committed by Rafael J. Wysocki
parent 42a4df0026
commit 1b750e3bda
1 changed files with 11 additions and 27 deletions
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38
drivers/cpufreq/cpufreq.c
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@ -67,13 +67,11 @@ static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
static DEFINE_PER_CPU(struct rw_semaphore, cpu_policy_rwsem);
#define lock_policy_rwsem(mode, cpu) \
static int lock_policy_rwsem_##mode(int cpu) \
static void lock_policy_rwsem_##mode(int cpu) \
{ \
struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); \
BUG_ON(!policy); \
down_##mode(&per_cpu(cpu_policy_rwsem, policy->cpu)); \
\
return 0; \
}
lock_policy_rwsem(read, cpu);
@ -653,13 +651,12 @@ static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
{
struct cpufreq_policy *policy = to_policy(kobj);
struct freq_attr *fattr = to_attr(attr);
ssize_t ret = -EINVAL;
ssize_t ret;
if (!down_read_trylock(&cpufreq_rwsem))
goto exit;
return -EINVAL;
if (lock_policy_rwsem_read(policy->cpu) < 0)
goto up_read;
lock_policy_rwsem_read(policy->cpu);
if (fattr->show)
ret = fattr->show(policy, buf);
@ -667,10 +664,8 @@ static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
ret = -EIO;
unlock_policy_rwsem_read(policy->cpu);
up_read:
up_read(&cpufreq_rwsem);
exit:
return ret;
}
@ -689,8 +684,7 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr,
if (!down_read_trylock(&cpufreq_rwsem))
goto unlock;
if (lock_policy_rwsem_write(policy->cpu) < 0)
goto up_read;
lock_policy_rwsem_write(policy->cpu);
if (fattr->store)
ret = fattr->store(policy, buf, count);
@ -699,7 +693,6 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr,
unlock_policy_rwsem_write(policy->cpu);
up_read:
up_read(&cpufreq_rwsem);
unlock:
put_online_cpus();
@ -1147,7 +1140,7 @@ static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy,
if (ret) {
pr_err("%s: Failed to move kobj: %d", __func__, ret);
WARN_ON(lock_policy_rwsem_write(old_cpu));
lock_policy_rwsem_write(old_cpu);
cpumask_set_cpu(old_cpu, policy->cpus);
unlock_policy_rwsem_write(old_cpu);
@ -1243,7 +1236,7 @@ static int __cpufreq_remove_dev_finish(struct device *dev,
return -EINVAL;
}
WARN_ON(lock_policy_rwsem_write(cpu));
lock_policy_rwsem_write(cpu);
cpus = cpumask_weight(policy->cpus);
if (cpus > 1)
@ -1466,14 +1459,11 @@ unsigned int cpufreq_get(unsigned int cpu)
if (!down_read_trylock(&cpufreq_rwsem))
return 0;
if (unlikely(lock_policy_rwsem_read(cpu)))
goto out_policy;
lock_policy_rwsem_read(cpu);
ret_freq = __cpufreq_get(cpu);
unlock_policy_rwsem_read(cpu);
out_policy:
up_read(&cpufreq_rwsem);
return ret_freq;
@ -1697,14 +1687,12 @@ int cpufreq_driver_target(struct cpufreq_policy *policy,
{
int ret = -EINVAL;
if (unlikely(lock_policy_rwsem_write(policy->cpu)))
goto fail;
lock_policy_rwsem_write(policy->cpu);
ret = __cpufreq_driver_target(policy, target_freq, relation);
unlock_policy_rwsem_write(policy->cpu);
fail:
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_driver_target);
@ -1995,10 +1983,7 @@ int cpufreq_update_policy(unsigned int cpu)
goto no_policy;
}
if (unlikely(lock_policy_rwsem_write(cpu))) {
ret = -EINVAL;
goto fail;
}
lock_policy_rwsem_write(cpu);
pr_debug("updating policy for CPU %u\n", cpu);
memcpy(&new_policy, policy, sizeof(*policy));
@ -2027,7 +2012,6 @@ int cpufreq_update_policy(unsigned int cpu)
unlock_policy_rwsem_write(cpu);
fail:
cpufreq_cpu_put(policy);
no_policy:
return ret;