Revert "cpufreq: suspend governors on system suspend/hibernate"

Commit 5a87182a (cpufreq: suspend governors on system
suspend/hibernate) causes hibernation problems to happen on
Bjørn Mork's and Paul Bolle's systems, so revert it.

Fixes: 5a87182a (cpufreq: suspend governors on system suspend/hibernate)
Reported-by: Bjørn Mork <bjorn@mork.no>
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/main.c

@@ -29,7 +29,6 @@
 #include <linux/async.h>
 #include <linux/suspend.h>
 #include <trace/events/power.h>
-#include <linux/cpufreq.h>
 #include <linux/cpuidle.h>
 #include <linux/timer.h>
 
@@ -541,7 +540,6 @@ static void dpm_resume_noirq(pm_message_t state)
 	dpm_show_time(starttime, state, "noirq");
 	resume_device_irqs();
 	cpuidle_resume();
-	cpufreq_resume();
 }
 
 /**
@@ -957,7 +955,6 @@ static int dpm_suspend_noirq(pm_message_t state)
 	ktime_t starttime = ktime_get();
 	int error = 0;
 
-	cpufreq_suspend();
 	cpuidle_pause();
 	suspend_device_irqs();
 	mutex_lock(&dpm_list_mtx);

drivers/cpufreq/cpufreq.c

@@ -26,7 +26,6 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
-#include <linux/suspend.h>
 #include <linux/syscore_ops.h>
 #include <linux/tick.h>
 #include <trace/events/power.h>
@@ -48,9 +47,6 @@ static LIST_HEAD(cpufreq_policy_list);
 static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
 #endif
 
-/* Flag to suspend/resume CPUFreq governors */
-static bool cpufreq_suspended;
-
 static inline bool has_target(void)
 {
 	return cpufreq_driver->target_index || cpufreq_driver->target;
@@ -1466,41 +1462,6 @@ static struct subsys_interface cpufreq_interface = {
 	.remove_dev	= cpufreq_remove_dev,
 };
 
-void cpufreq_suspend(void)
-{
-	struct cpufreq_policy *policy;
-
-	if (!has_target())
-		return;
-
-	pr_debug("%s: Suspending Governors\n", __func__);
-
-	list_for_each_entry(policy, &cpufreq_policy_list, policy_list)
-		if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP))
-			pr_err("%s: Failed to stop governor for policy: %p\n",
-				__func__, policy);
-
-	cpufreq_suspended = true;
-}
-
-void cpufreq_resume(void)
-{
-	struct cpufreq_policy *policy;
-
-	if (!has_target())
-		return;
-
-	pr_debug("%s: Resuming Governors\n", __func__);
-
-	cpufreq_suspended = false;
-
-	list_for_each_entry(policy, &cpufreq_policy_list, policy_list)
-		if (__cpufreq_governor(policy, CPUFREQ_GOV_START)
-		    || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS))
-			pr_err("%s: Failed to start governor for policy: %p\n",
-				__func__, policy);
-}
-
 /**
  * cpufreq_bp_suspend - Prepare the boot CPU for system suspend.
  *
@@ -1803,10 +1764,6 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
 	struct cpufreq_governor *gov = NULL;
 #endif
 
-	/* Don't start any governor operations if we are entering suspend */
-	if (cpufreq_suspended)
-		return 0;
-
 	if (policy->governor->max_transition_latency &&
 	    policy->cpuinfo.transition_latency >
 	    policy->governor->max_transition_latency) {

include/linux/cpufreq.h

@@ -280,14 +280,6 @@ cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
 			policy->cpuinfo.max_freq);
 }
 
-#ifdef CONFIG_CPU_FREQ
-void cpufreq_suspend(void);
-void cpufreq_resume(void);
-#else
-static inline void cpufreq_suspend(void) {}
-static inline void cpufreq_resume(void) {}
-#endif
-
 /*********************************************************************
  *                     CPUFREQ NOTIFIER INTERFACE                    *
  *********************************************************************/