X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fcpufreq%2Fcpufreq.c;h=1d41496ed2f83b648e1311ee8fecccbd56ad741d;hb=ea0c62f7cf70f13a67830471b613337bd0c9a62e;hp=be78c07f72cae230bfe08b19996969bd2194e74b;hpb=457091181176643787a547dc04eb3cf5dcd822ce;p=linux-2.6

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index be78c07f72..1d41496ed2 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -118,9 +118,11 @@ static void handle_update(struct work_struct *work);
 static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);
 static struct srcu_notifier_head cpufreq_transition_notifier_list;
 
+static bool init_cpufreq_transition_notifier_list_called;
 static int __init init_cpufreq_transition_notifier_list(void)
 {
 	srcu_init_notifier_head(&cpufreq_transition_notifier_list);
+	init_cpufreq_transition_notifier_list_called = true;
 	return 0;
 }
 pure_initcall(init_cpufreq_transition_notifier_list);
@@ -410,7 +412,7 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
 				int ret;
 
 				mutex_unlock(&cpufreq_governor_mutex);
-				ret = request_module(name);
+				ret = request_module("%s", name);
 				mutex_lock(&cpufreq_governor_mutex);
 
 				if (ret == 0)
@@ -581,15 +583,13 @@ out:
 	i += sprintf(&buf[i], "\n");
 	return i;
 }
-/**
- * show_affected_cpus - show the CPUs affected by each transition
- */
-static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
+
+static ssize_t show_cpus(cpumask_t mask, char *buf)
 {
 	ssize_t i = 0;
 	unsigned int cpu;
 
-	for_each_cpu_mask(cpu, policy->cpus) {
+	for_each_cpu_mask(cpu, mask) {
 		if (i)
 			i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
 		i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
@@ -600,13 +600,32 @@ static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
 	return i;
 }
 
+/**
+ * show_related_cpus - show the CPUs affected by each transition even if
+ * hw coordination is in use
+ */
+static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf)
+{
+	if (cpus_empty(policy->related_cpus))
+		return show_cpus(policy->cpus, buf);
+	return show_cpus(policy->related_cpus, buf);
+}
+
+/**
+ * show_affected_cpus - show the CPUs affected by each transition
+ */
+static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
+{
+	return show_cpus(policy->cpus, buf);
+}
+
 static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
 					const char *buf, size_t count)
 {
 	unsigned int freq = 0;
 	unsigned int ret;
 
-	if (!policy->governor->store_setspeed)
+	if (!policy->governor || !policy->governor->store_setspeed)
 		return -EINVAL;
 
 	ret = sscanf(buf, "%u", &freq);
@@ -620,7 +639,7 @@ static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
 
 static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
 {
-	if (!policy->governor->show_setspeed)
+	if (!policy->governor || !policy->governor->show_setspeed)
 		return sprintf(buf, "<unsupported>\n");
 
 	return policy->governor->show_setspeed(policy, buf);
@@ -644,6 +663,7 @@ define_one_ro(cpuinfo_max_freq);
 define_one_ro(scaling_available_governors);
 define_one_ro(scaling_driver);
 define_one_ro(scaling_cur_freq);
+define_one_ro(related_cpus);
 define_one_ro(affected_cpus);
 define_one_rw(scaling_min_freq);
 define_one_rw(scaling_max_freq);
@@ -656,6 +676,7 @@ static struct attribute *default_attrs[] = {
 	&scaling_min_freq.attr,
 	&scaling_max_freq.attr,
 	&affected_cpus.attr,
+	&related_cpus.attr,
 	&scaling_governor.attr,
 	&scaling_driver.attr,
 	&scaling_available_governors.attr,
@@ -907,13 +928,13 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 	policy->user_policy.policy = policy->policy;
 	policy->user_policy.governor = policy->governor;
 
-	unlock_policy_rwsem_write(cpu);
-
 	if (ret) {
 		dprintk("setting policy failed\n");
 		goto err_out_unregister;
 	}
 
+	unlock_policy_rwsem_write(cpu);
+
 	kobject_uevent(&policy->kobj, KOBJ_ADD);
 	module_put(cpufreq_driver->owner);
 	dprintk("initialization complete\n");
@@ -1367,6 +1388,8 @@ int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
 {
 	int ret;
 
+	WARN_ON(!init_cpufreq_transition_notifier_list_called);
+
 	switch (list) {
 	case CPUFREQ_TRANSITION_NOTIFIER:
 		ret = srcu_notifier_chain_register(