cpufreq: Initialize policy->kobj while allocating policy
policy->kobj is required to be initialized once in the lifetime of a
policy. Currently we are initializing it from __cpufreq_add_dev() and
that doesn't look to be the best place for doing so as we have to do
this on special cases (like: !recover_policy).
We can initialize it from a more obvious place cpufreq_policy_alloc()
and that will make code look cleaner, specially the error handling part.
The error handling part of __cpufreq_add_dev() was doing almost the same
thing while recover_policy is true or false. Fix that as well by always
calling cpufreq_policy_put_kobj() with an additional parameter to skip
notification part of it.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 4bfe0a53..dbb1bd6 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1134,9 +1134,10 @@
return policy;
}
-static struct cpufreq_policy *cpufreq_policy_alloc(int cpu)
+static struct cpufreq_policy *cpufreq_policy_alloc(struct device *dev)
{
struct cpufreq_policy *policy;
+ int ret;
policy = kzalloc(sizeof(*policy), GFP_KERNEL);
if (!policy)
@@ -1148,6 +1149,13 @@
if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
goto err_free_cpumask;
+ ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, &dev->kobj,
+ "cpufreq");
+ if (ret) {
+ pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret);
+ goto err_free_rcpumask;
+ }
+
INIT_LIST_HEAD(&policy->policy_list);
init_rwsem(&policy->rwsem);
spin_lock_init(&policy->transition_lock);
@@ -1155,13 +1163,15 @@
init_completion(&policy->kobj_unregister);
INIT_WORK(&policy->update, handle_update);
- policy->cpu = cpu;
+ policy->cpu = dev->id;
/* Set this once on allocation */
- policy->kobj_cpu = cpu;
+ policy->kobj_cpu = dev->id;
return policy;
+err_free_rcpumask:
+ free_cpumask_var(policy->related_cpus);
err_free_cpumask:
free_cpumask_var(policy->cpus);
err_free_policy:
@@ -1170,13 +1180,14 @@
return NULL;
}
-static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
+static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy, bool notify)
{
struct kobject *kobj;
struct completion *cmp;
- blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
- CPUFREQ_REMOVE_POLICY, policy);
+ if (notify)
+ blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+ CPUFREQ_REMOVE_POLICY, policy);
down_write(&policy->rwsem);
cpufreq_remove_dev_symlink(policy);
@@ -1270,7 +1281,7 @@
policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL;
if (!policy) {
recover_policy = false;
- policy = cpufreq_policy_alloc(cpu);
+ policy = cpufreq_policy_alloc(dev);
if (!policy)
goto nomem_out;
}
@@ -1310,15 +1321,6 @@
policy->user_policy.min = policy->min;
policy->user_policy.max = policy->max;
- /* prepare interface data */
- ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
- &dev->kobj, "cpufreq");
- if (ret) {
- pr_err("%s: failed to init policy->kobj: %d\n",
- __func__, ret);
- goto err_init_policy_kobj;
- }
-
write_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_cpu(j, policy->related_cpus)
per_cpu(cpufreq_cpu_data, j) = policy;
@@ -1410,18 +1412,12 @@
err_out_unregister:
err_get_freq:
- if (!recover_policy) {
- kobject_put(&policy->kobj);
- wait_for_completion(&policy->kobj_unregister);
- }
-err_init_policy_kobj:
up_write(&policy->rwsem);
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
err_set_policy_cpu:
- if (recover_policy)
- cpufreq_policy_put_kobj(policy);
+ cpufreq_policy_put_kobj(policy, recover_policy);
cpufreq_policy_free(policy);
nomem_out:
@@ -1517,7 +1513,7 @@
/* Free the policy kobjects only if the driver is getting removed. */
if (sif)
- cpufreq_policy_put_kobj(policy);
+ cpufreq_policy_put_kobj(policy, true);
/*
* Perform the ->exit() even during light-weight tear-down,
@@ -1567,7 +1563,7 @@
return 0;
}
- cpufreq_policy_put_kobj(policy);
+ cpufreq_policy_put_kobj(policy, true);
cpufreq_policy_free(policy);
return 0;
}