cpufreq: preserve user_policy across suspend/resume

Prevent __cpufreq_add_dev() from overwriting the existing values of
user_policy.{min|max|policy|governor} with defaults during resume
from system suspend.

Fixes: 5302c3fb2e62 ("cpufreq: Perform light-weight init/teardown during suspend/resume")
Reported-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index f13a663d1da500202863f0c9a019fb7b4cb74e5f..8d19f7c06010c364ff6ee758c15096c252f9f4bd 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -839,9 +839,6 @@ static void cpufreq_init_policy(struct cpufreq_policy *policy)
 
        /* set default policy */
        ret = cpufreq_set_policy(policy, &new_policy);
-       policy->user_policy.policy = policy->policy;
-       policy->user_policy.governor = policy->governor;
-
        if (ret) {
                pr_debug("setting policy failed\n");
                if (cpufreq_driver->exit)
@@ -1071,8 +1068,10 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
         */
        cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
 
-       policy->user_policy.min = policy->min;
-       policy->user_policy.max = policy->max;
+       if (!frozen) {
+               policy->user_policy.min = policy->min;
+               policy->user_policy.max = policy->max;
+       }
 
        blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
                                     CPUFREQ_START, policy);
@@ -1103,6 +1102,11 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
 
        cpufreq_init_policy(policy);
 
+       if (!frozen) {
+               policy->user_policy.policy = policy->policy;
+               policy->user_policy.governor = policy->governor;
+       }
+
        kobject_uevent(&policy->kobj, KOBJ_ADD);
        up_read(&cpufreq_rwsem);