cpufreq: create sysfs symlink for cpus onlined after boot

Commit Message

Viresh Kumar April 10, 2017, 10:11 a.m. UTC

On 27-03-17, 19:29, Rafael J. Wysocki wrote:
> OK, queued up, thanks!
> 
> I'll push it for merging by the end of the week unless someone (Viresh in
> particular) finds any problems with it.

Sorry for being late to the party. I don't see any cases where this
would break, but maybe we can simplify things by always creating links
while onlining a CPU.

Patch

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index bc96d423781a..f700e06d4bad 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -922,9 +922,6 @@  static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu)
 {
        struct device *dev = get_cpu_device(cpu);
 
-       if (!dev)
-               return;
-
        if (cpumask_test_and_set_cpu(cpu, policy->real_cpus))
                return;
 
@@ -1013,6 +1010,8 @@  static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cp
 {
        int ret = 0;
 
+       add_cpu_dev_symlink(policy, cpu);
+
        /* Has this CPU been taken care of already? */
        if (cpumask_test_cpu(cpu, policy->cpus))
                return 0;
@@ -1188,10 +1187,8 @@  static int cpufreq_online(unsigned int cpu)
                policy->user_policy.min = policy->min;
                policy->user_policy.max = policy->max;
 
-               for_each_cpu(j, policy->related_cpus) {
+               for_each_cpu(j, policy->related_cpus)
                        per_cpu(cpufreq_cpu_data, j) = policy;
-                       add_cpu_dev_symlink(policy, j);
-               }
        } else {
                policy->min = policy->user_policy.min;
                policy->max = policy->user_policy.max;
@@ -1266,6 +1263,7 @@  static int cpufreq_online(unsigned int cpu)
                goto out_exit_policy;
        }
 
+       add_cpu_dev_symlink(policy, cpu);
        up_write(&policy->rwsem);
 
        kobject_uevent(&policy->kobj, KOBJ_ADD);
@@ -1311,11 +1309,6 @@  static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
                        return ret;
        }
 
-       /* Create sysfs link on CPU registration */
-       policy = per_cpu(cpufreq_cpu_data, cpu);
-       if (policy)
-               add_cpu_dev_symlink(policy, cpu);
-
        return 0;
 }