The offline routine was separated into two halves earlier by 'commit 1aee40ac9c86 ("cpufreq: Invoke __cpufreq_remove_dev_finish() after releasing cpu_hotplug.lock");.
And the reasons cited were, race issues between accessing policy's sysfs files and policy kobject's cleanup.
That race isn't valid anymore, as we don't remove the policy & its kobject completely on hotplugs, but do that from ->remove() callback of subsys framework.
These two routines can be merged back now.
This is a preparatory step for the next patch, that will enforce policy->rwsem lock around __cpufreq_governor() routines STOP/EXIT sequence.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/cpufreq/cpufreq.c | 36 ++++++++++-------------------------- 1 file changed, 10 insertions(+), 26 deletions(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 5f7e24567e0e..dc43294e7b31 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1309,9 +1309,10 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) return ret; }
-static void cpufreq_offline_prepare(unsigned int cpu) +static void cpufreq_offline(unsigned int cpu) { struct cpufreq_policy *policy; + int ret;
pr_debug("%s: unregistering CPU %u\n", __func__, cpu);
@@ -1322,7 +1323,7 @@ static void cpufreq_offline_prepare(unsigned int cpu) }
if (has_target()) { - int ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); if (ret) pr_err("%s: Failed to stop governor\n", __func__); } @@ -1345,34 +1346,23 @@ static void cpufreq_offline_prepare(unsigned int cpu) /* Start governor again for active policy */ if (!policy_is_inactive(policy)) { if (has_target()) { - int ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); + ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); if (!ret) ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
if (ret) pr_err("%s: Failed to start governor\n", __func__); } - } else if (cpufreq_driver->stop_cpu) { - cpufreq_driver->stop_cpu(policy); - } -}
-static void cpufreq_offline_finish(unsigned int cpu) -{ - struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); - - if (!policy) { - pr_debug("%s: No cpu_data found\n", __func__); return; }
- /* Only proceed for inactive policies */ - if (!policy_is_inactive(policy)) - return; + if (cpufreq_driver->stop_cpu) + cpufreq_driver->stop_cpu(policy);
/* If cpu is last user of policy, free policy */ if (has_target()) { - int ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); + ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); if (ret) pr_err("%s: Failed to exit governor\n", __func__); } @@ -1401,10 +1391,8 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) if (!policy) return;
- if (cpu_online(cpu)) { - cpufreq_offline_prepare(cpu); - cpufreq_offline_finish(cpu); - } + if (cpu_online(cpu)) + cpufreq_offline(cpu);
cpumask_clear_cpu(cpu, policy->real_cpus); remove_cpu_dev_symlink(policy, cpu); @@ -2255,11 +2243,7 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb, break;
case CPU_DOWN_PREPARE: - cpufreq_offline_prepare(cpu); - break; - - case CPU_POST_DEAD: - cpufreq_offline_finish(cpu); + cpufreq_offline(cpu); break;
case CPU_DOWN_FAILED: