From 83933af4720b282f6f6a0b6c05a2a47b4cf08819 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@infradead.org>
Date: Sat, 14 Jan 2006 16:01:49 +0100
Subject: [PATCH] [CPUFREQ] convert remaining cpufreq semaphore to a mutex

This one fell through the automation at first because it initializes the
semaphore to locked, but that's easily remedied

Signed-off-by:  Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Dave Jones <davej@redhat.com>

 drivers/cpufreq/cpufreq.c |   37 +++++++++++++++++++------------------
 include/linux/cpufreq.h   |    3 ++-
 2 files changed, 21 insertions(+), 19 deletions(-)
---
 drivers/cpufreq/cpufreq.c | 37 +++++++++++++++++++------------------
 include/linux/cpufreq.h   |  3 ++-
 2 files changed, 21 insertions(+), 19 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index eb2f19d00e9..0675d9f02e3 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -601,7 +601,8 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
 	policy->cpu = cpu;
 	policy->cpus = cpumask_of_cpu(cpu);
 
-	init_MUTEX_LOCKED(&policy->lock);
+	mutex_init(&policy->lock);
+	mutex_lock(&policy->lock);
 	init_completion(&policy->kobj_unregister);
 	INIT_WORK(&policy->update, handle_update, (void *)(long)cpu);
 
@@ -642,7 +643,7 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
 	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
 	policy->governor = NULL; /* to assure that the starting sequence is
 				  * run in cpufreq_set_policy */
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 	
 	/* set default policy */
 	
@@ -763,10 +764,10 @@ static int cpufreq_remove_dev (struct sys_device * sys_dev)
 	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
 #endif
 
-	down(&data->lock);
+	mutex_lock(&data->lock);
 	if (cpufreq_driver->target)
 		__cpufreq_governor(data, CPUFREQ_GOV_STOP);
-	up(&data->lock);
+	mutex_unlock(&data->lock);
 
 	kobject_unregister(&data->kobj);
 
@@ -835,9 +836,9 @@ unsigned int cpufreq_quick_get(unsigned int cpu)
 	unsigned int ret = 0;
 
 	if (policy) {
-		down(&policy->lock);
+		mutex_lock(&policy->lock);
 		ret = policy->cur;
-		up(&policy->lock);
+		mutex_unlock(&policy->lock);
 		cpufreq_cpu_put(policy);
 	}
 
@@ -863,7 +864,7 @@ unsigned int cpufreq_get(unsigned int cpu)
 	if (!cpufreq_driver->get)
 		goto out;
 
-	down(&policy->lock);
+	mutex_lock(&policy->lock);
 
 	ret = cpufreq_driver->get(cpu);
 
@@ -876,7 +877,7 @@ unsigned int cpufreq_get(unsigned int cpu)
 		}
 	}
 
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 
  out:
 	cpufreq_cpu_put(policy);
@@ -1159,11 +1160,11 @@ int cpufreq_driver_target(struct cpufreq_policy *policy,
 	if (!policy)
 		return -EINVAL;
 
-	down(&policy->lock);
+	mutex_lock(&policy->lock);
 
 	ret = __cpufreq_driver_target(policy, target_freq, relation);
 
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 
 	cpufreq_cpu_put(policy);
 
@@ -1200,9 +1201,9 @@ int cpufreq_governor(unsigned int cpu, unsigned int event)
 	if (!policy)
 		return -EINVAL;
 
-	down(&policy->lock);
+	mutex_lock(&policy->lock);
 	ret = __cpufreq_governor(policy, event);
-	up(&policy->lock);
+	mutex_unlock(&policy->lock);
 
 	cpufreq_cpu_put(policy);
 
@@ -1269,9 +1270,9 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
 	if (!cpu_policy)
 		return -EINVAL;
 
-	down(&cpu_policy->lock);
+	mutex_lock(&cpu_policy->lock);
 	memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy));
-	up(&cpu_policy->lock);
+	mutex_unlock(&cpu_policy->lock);
 
 	cpufreq_cpu_put(cpu_policy);
 
@@ -1383,7 +1384,7 @@ int cpufreq_set_policy(struct cpufreq_policy *policy)
 		return -EINVAL;
 
 	/* lock this CPU */
-	down(&data->lock);
+	mutex_lock(&data->lock);
 
 	ret = __cpufreq_set_policy(data, policy);
 	data->user_policy.min = data->min;
@@ -1391,7 +1392,7 @@ int cpufreq_set_policy(struct cpufreq_policy *policy)
 	data->user_policy.policy = data->policy;
 	data->user_policy.governor = data->governor;
 
-	up(&data->lock);
+	mutex_unlock(&data->lock);
 	cpufreq_cpu_put(data);
 
 	return ret;
@@ -1415,7 +1416,7 @@ int cpufreq_update_policy(unsigned int cpu)
 	if (!data)
 		return -ENODEV;
 
-	down(&data->lock);
+	mutex_lock(&data->lock);
 
 	dprintk("updating policy for CPU %u\n", cpu);
 	memcpy(&policy, 
@@ -1428,7 +1429,7 @@ int cpufreq_update_policy(unsigned int cpu)
 
 	ret = __cpufreq_set_policy(data, &policy);
 
-	up(&data->lock);
+	mutex_unlock(&data->lock);
 
 	cpufreq_cpu_put(data);
 	return ret;
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index c31650df924..17866d7e2b7 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -14,6 +14,7 @@
 #ifndef _LINUX_CPUFREQ_H
 #define _LINUX_CPUFREQ_H
 
+#include <linux/mutex.h>
 #include <linux/config.h>
 #include <linux/notifier.h>
 #include <linux/threads.h>
@@ -82,7 +83,7 @@ struct cpufreq_policy {
         unsigned int		policy; /* see above */
 	struct cpufreq_governor	*governor; /* see below */
 
- 	struct semaphore	lock;   /* CPU ->setpolicy or ->target may
+ 	struct mutex		lock;   /* CPU ->setpolicy or ->target may
 					   only be called once a time */
 
 	struct work_struct	update; /* if update_policy() needs to be
-- 
2.43.2