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Date: Tue, 17 Sep 2013 09:28:39 +0100
From: "Jon Medhurst (Tixy)" <tixy@...aro.org>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: rjw@...k.pl, linaro-kernel@...ts.linaro.org, patches@...aro.org,
cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, srivatsa.bhat@...ux.vnet.ibm.com
Subject: Re: [PATCH 2/2] cpufreq: make return type of
lock_policy_rwsem_{read|write}() as void
On Mon, 2013-09-16 at 20:40 +0530, Viresh Kumar wrote:
> lock_policy_rwsem_{read|write}() currently has return type of int but it always
> return zero and hence its return type must be void instead. This patch makes its
> return type void and fixes all users of it as well.
>
> Reported-by: Jon Medhurst<tixy@...aro.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Tested-by: Jon Medhurst <tixy@...aro.org>
> ---
> drivers/cpufreq/cpufreq.c | 38 +++++++++++---------------------------
> 1 file changed, 11 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index c18bf7b..598af5c 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -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();
> @@ -1143,7 +1136,7 @@ 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);
>
> @@ -1196,7 +1189,7 @@ static int __cpufreq_remove_dev_prepare(struct device *dev,
> policy->governor->name, CPUFREQ_NAME_LEN);
> #endif
>
> - WARN_ON(lock_policy_rwsem_write(cpu));
> + lock_policy_rwsem_write(cpu);
> cpus = cpumask_weight(policy->cpus);
>
> if (cpus > 1)
> @@ -1459,14 +1452,11 @@ 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;
> @@ -1690,14 +1680,12 @@ 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);
> @@ -1988,10 +1976,7 @@ 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));
> @@ -2020,7 +2005,6 @@ int cpufreq_update_policy(unsigned int cpu)
>
> unlock_policy_rwsem_write(cpu);
>
> -fail:
> cpufreq_cpu_put(policy);
> no_policy:
> return ret;
--
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