policy->kobj is required to be initialized once in the lifetime of a policy while its allocated. 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 some steps.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/cpufreq/cpufreq.c | 45 ++++++++++++++++++++------------------------- 1 file changed, 20 insertions(+), 25 deletions(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index fde0a75f9692..4a97d7428d25 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1067,9 +1067,10 @@ static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) 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) @@ -1081,6 +1082,13 @@ static struct cpufreq_policy *cpufreq_policy_alloc(int cpu) 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_LIST_HEAD(&policy->fallback_list); init_rwsem(&policy->rwsem); @@ -1089,13 +1097,15 @@ static struct cpufreq_policy *cpufreq_policy_alloc(int cpu) 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: @@ -1104,13 +1114,14 @@ static struct cpufreq_policy *cpufreq_policy_alloc(int cpu) 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_add_remove_dev_symlink(policy, false); @@ -1171,7 +1182,7 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) 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; } else { @@ -1206,15 +1217,6 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) if (!recover_policy) { 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); @@ -1305,19 +1307,12 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) write_lock_irqsave(&cpufreq_driver_lock, flags); list_del(&policy->policy_list); write_unlock_irqrestore(&cpufreq_driver_lock, flags); - - 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: @@ -1452,7 +1447,7 @@ static int __cpufreq_remove_dev_finish(struct device *dev,
/* 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,