cpufreq: powernv: Remove flag use-case of policy->driver_data

commit 1b0289848d5d ("cpufreq: powernv: Add sysfs attributes to show
throttle stats") used policy->driver_data as a flag for one-time creation
of throttle sysfs files. Instead of this use 'kernfs_find_and_get()' to
check if the attribute already exists. This is required as
policy->driver_data is used for other purposes in the later patch.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 39ac78c94be0f3c191aaf5868cd3c2154ab5fb59..e2e221904d2554ea3f22394162464b8fb6f8da49 100644 (file)
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -455,13 +455,15 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
 static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
 {
        int base, i;
+       struct kernfs_node *kn;
 
        base = cpu_first_thread_sibling(policy->cpu);
 
        for (i = 0; i < threads_per_core; i++)
                cpumask_set_cpu(base + i, policy->cpus);
 
-       if (!policy->driver_data) {
+       kn = kernfs_find_and_get(policy->kobj.sd, throttle_attr_grp.name);
+       if (!kn) {
                int ret;
 
                ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp);
@@ -470,11 +472,8 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
                                policy->cpu);
                        return ret;
                }
-               /*
-                * policy->driver_data is used as a flag for one-time
-                * creation of throttle sysfs files.
-                */
-               policy->driver_data = policy;
+       } else {
+               kernfs_put(kn);
        }
        return cpufreq_table_validate_and_show(policy, powernv_freqs);
 }