Merge branch 'pm-cpufreq'

* pm-cpufreq:
intel_pstate: Add Haswell CPU models
Revert "cpufreq: make sure frequency transitions are serialized"
cpufreq: Use signed type for 'ret' variable, to store negative error values
cpufreq: Remove temporary fix for race between CPU hotplug and sysfs-writes
cpufreq: Synchronize the cpufreq store_*() routines with CPU hotplug
cpufreq: Invoke __cpufreq_remove_dev_finish() after releasing cpu_hotplug.lock
cpufreq: Split __cpufreq_remove_dev() into two parts
cpufreq: Fix wrong time unit conversion
cpufreq: serialize calls to __cpufreq_governor()
cpufreq: don't allow governor limits to be changed when it is disabled

drivers/cpufreq/cpufreq.c

···
 	switch (state) {
 
 	case CPUFREQ_PRECHANGE:
-		if (WARN(policy->transition_ongoing ==
-					cpumask_weight(policy->cpus),
-				"In middle of another frequency transition\n"))
-			return;
-
-		policy->transition_ongoing++;
-
 		/* detect if the driver reported a value as "old frequency"
 		 * which is not equal to what the cpufreq core thinks is
 		 * "old frequency".
···
 		break;
 
 	case CPUFREQ_POSTCHANGE:
-		if (WARN(!policy->transition_ongoing,
-				"No frequency transition in progress\n"))
-			return;
-
-		policy->transition_ongoing--;
-
 		adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
 		pr_debug("FREQ: %lu - CPU: %lu", (unsigned long)freqs->new,
 			(unsigned long)freqs->cpu);
···
 static ssize_t store_##file_name					\
 (struct cpufreq_policy *policy, const char *buf, size_t count)		\
 {									\
-	unsigned int ret;						\
+	int ret;							\
 	struct cpufreq_policy new_policy;				\
 									\
 	ret = cpufreq_get_policy(&new_policy, policy->cpu);		\
···
 static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
 					const char *buf, size_t count)
 {
-	unsigned int ret;
+	int ret;
 	char	str_governor[16];
 	struct cpufreq_policy new_policy;
 
···
 	struct freq_attr *fattr = to_attr(attr);
 	ssize_t ret = -EINVAL;
 
+	get_online_cpus();
+
+	if (!cpu_online(policy->cpu))
+		goto unlock;
+
 	if (!down_read_trylock(&cpufreq_rwsem))
-		goto exit;
+		goto unlock;
 
 	if (lock_policy_rwsem_write(policy->cpu) < 0)
 		goto up_read;
···
 
 up_read:
 	up_read(&cpufreq_rwsem);
-exit:
+unlock:
+	put_online_cpus();
+
 	return ret;
 }
 
···
 	return cpu_dev->id;
 }
 
-/**
- * __cpufreq_remove_dev - remove a CPU device
- *
- * Removes the cpufreq interface for a CPU device.
- * Caller should already have policy_rwsem in write mode for this CPU.
- * This routine frees the rwsem before returning.
- */
-static int __cpufreq_remove_dev(struct device *dev,
-				struct subsys_interface *sif, bool frozen)
+static int __cpufreq_remove_dev_prepare(struct device *dev,
+					struct subsys_interface *sif,
+					bool frozen)
 {
 	unsigned int cpu = dev->id, cpus;
 	int new_cpu, ret;
 	unsigned long flags;
 	struct cpufreq_policy *policy;
-	struct kobject *kobj;
-	struct completion *cmp;
 
 	pr_debug("%s: unregistering CPU %u\n", __func__, cpu);
 
···
 			}
 		}
 	}
+
+	return 0;
+}
+
+static int __cpufreq_remove_dev_finish(struct device *dev,
+				       struct subsys_interface *sif,
+				       bool frozen)
+{
+	unsigned int cpu = dev->id, cpus;
+	int ret;
+	unsigned long flags;
+	struct cpufreq_policy *policy;
+	struct kobject *kobj;
+	struct completion *cmp;
+
+	read_lock_irqsave(&cpufreq_driver_lock, flags);
+	policy = per_cpu(cpufreq_cpu_data, cpu);
+	read_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+	if (!policy) {
+		pr_debug("%s: No cpu_data found\n", __func__);
+		return -EINVAL;
+	}
+
+	lock_policy_rwsem_read(cpu);
+	cpus = cpumask_weight(policy->cpus);
+	unlock_policy_rwsem_read(cpu);
 
 	/* If cpu is last user of policy, free policy */
 	if (cpus == 1) {
···
 
 	per_cpu(cpufreq_cpu_data, cpu) = NULL;
 	return 0;
+}
+
+/**
+ * __cpufreq_remove_dev - remove a CPU device
+ *
+ * Removes the cpufreq interface for a CPU device.
+ * Caller should already have policy_rwsem in write mode for this CPU.
+ * This routine frees the rwsem before returning.
+ */
+static inline int __cpufreq_remove_dev(struct device *dev,
+				       struct subsys_interface *sif,
+				       bool frozen)
+{
+	int ret;
+
+	ret = __cpufreq_remove_dev_prepare(dev, sif, frozen);
+
+	if (!ret)
+		ret = __cpufreq_remove_dev_finish(dev, sif, frozen);
+
+	return ret;
 }
 
 static int cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
···
 
 	if (cpufreq_disabled())
 		return -ENODEV;
-	if (policy->transition_ongoing)
-		return -EBUSY;
 
 	/* Make sure that target_freq is within supported range */
 	if (target_freq > policy->max)
···
 						policy->cpu, event);
 
 	mutex_lock(&cpufreq_governor_lock);
-	if ((!policy->governor_enabled && (event == CPUFREQ_GOV_STOP)) ||
-	    (policy->governor_enabled && (event == CPUFREQ_GOV_START))) {
+	if ((policy->governor_enabled && event == CPUFREQ_GOV_START)
+	    || (!policy->governor_enabled
+	    && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) {
 		mutex_unlock(&cpufreq_governor_lock);
 		return -EBUSY;
 	}
···
 			break;
 
 		case CPU_DOWN_PREPARE:
-			__cpufreq_remove_dev(dev, NULL, frozen);
+			__cpufreq_remove_dev_prepare(dev, NULL, frozen);
+			break;
+
+		case CPU_POST_DEAD:
+			__cpufreq_remove_dev_finish(dev, NULL, frozen);
 			break;
 
 		case CPU_DOWN_FAILED:

drivers/cpufreq/cpufreq_stats.c

···
 	for (i = 0; i < stat->state_num; i++) {
 		len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
 			(unsigned long long)
-			cputime64_to_clock_t(stat->time_in_state[i]));
+			jiffies_64_to_clock_t(stat->time_in_state[i]));
 	}
 	return len;
 }

drivers/cpufreq/intel_pstate.c

···
 	ICPU(0x2a, default_policy),
 	ICPU(0x2d, default_policy),
 	ICPU(0x3a, default_policy),
+	ICPU(0x3c, default_policy),
+	ICPU(0x3e, default_policy),
+	ICPU(0x3f, default_policy),
+	ICPU(0x45, default_policy),
+	ICPU(0x46, default_policy),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);

include/linux/cpufreq.h

···
 	struct list_head        policy_list;
 	struct kobject		kobj;
 	struct completion	kobj_unregister;
-	int			transition_ongoing; /* Tracks transition status */
 };
 
 /* Only for ACPI */