[CPUFREQ] updated cpufreq ref-counting and locking scheme

This patch takes use of the now-working cpufreq_interface.kset and
cpufreq_policy.kobj to use reference counting within the cpufreq core
wherever this is more appropriate than the previous approach -- using one
semaphore. Additionally, the callbacks to the driver modules are protected
now.

arch/i386/kernel/cpu/cpufreq/acpi.c

@@ -619,6 +619,7 @@ static struct cpufreq_driver acpi_cpufreq_driver = {
 	.init		= acpi_cpufreq_cpu_init,
 	.exit		= acpi_cpufreq_cpu_exit,
 	.name		= "acpi-cpufreq",
+	.owner		= THIS_MODULE,
 };
 
 

arch/i386/kernel/cpu/cpufreq/elanfreq.c

@@ -250,6 +250,7 @@ static struct cpufreq_driver elanfreq_driver = {
 	.target 	= elanfreq_target,
 	.init		= elanfreq_cpu_init,
 	.name		= "elanfreq",
+	.owner		= THIS_MODULE,
 };
 
 

arch/i386/kernel/cpu/cpufreq/gx-suspmod.c

@@ -451,6 +451,7 @@ static struct cpufreq_driver gx_suspmod_driver = {
 	.target		= cpufreq_gx_target,
 	.init		= cpufreq_gx_cpu_init,
 	.name		= "gx-suspmod",
+	.owner		= THIS_MODULE,
 };
 
 static int __init cpufreq_gx_init(void)

arch/i386/kernel/cpu/cpufreq/longhaul.c

@@ -649,6 +649,7 @@ static struct cpufreq_driver longhaul_driver = {
 	.target 	= longhaul_target,
 	.init		= longhaul_cpu_init,
 	.name		= "longhaul",
+	.owner		= THIS_MODULE,
 };
 
 static int __init longhaul_init (void)

arch/i386/kernel/cpu/cpufreq/longrun.c

@@ -253,6 +253,7 @@ static struct cpufreq_driver longrun_driver = {
 	.setpolicy 	= longrun_set_policy,
 	.init		= longrun_cpu_init,
 	.name		= "longrun",
+	.owner		= THIS_MODULE,
 };
 
 

arch/i386/kernel/cpu/cpufreq/p4-clockmod.c

@@ -236,6 +236,7 @@ static struct cpufreq_driver p4clockmod_driver = {
 	.init		= cpufreq_p4_cpu_init,
 	.exit		= cpufreq_p4_cpu_exit,
 	.name		= "p4-clockmod",
+	.owner		= THIS_MODULE,
 };
 
 

arch/i386/kernel/cpu/cpufreq/powernow-k6.c

@@ -190,6 +190,7 @@ static struct cpufreq_driver powernow_k6_driver = {
 	.init		= powernow_k6_cpu_init,
 	.exit		= powernow_k6_cpu_exit,
 	.name		= "powernow-k6",
+	.owner		= THIS_MODULE,
 };
 
 

arch/i386/kernel/cpu/cpufreq/powernow-k7.c

@@ -377,6 +377,7 @@ static struct cpufreq_driver powernow_driver = {
 	.target 	= powernow_target,
 	.init		= powernow_cpu_init,
 	.name		= "powernow-k7",
+	.owner		= THIS_MODULE,
 };
 
 static int __init powernow_init (void)

arch/i386/kernel/cpu/cpufreq/speedstep.c

@@ -658,6 +658,7 @@ static struct cpufreq_driver speedstep_driver = {
 	.verify 	= speedstep_verify,
 	.target 	= speedstep_target,
 	.init		= speedstep_cpu_init,
+	.owner		= THIS_MODULE,
 };
 
 

arch/sparc64/kernel/us3_cpufreq.c

@@ -276,6 +276,7 @@ static int __init us3freq_init(void)
 		driver->target = us3freq_target;
 		driver->init = us3freq_cpu_init;
 		driver->exit = us3freq_cpu_exit;
+		driver->owner = THIS_MODULE,
 		strcpy(driver->name, "UltraSPARC-III");
 
 		cpufreq_us3_driver = driver;

drivers/cpufreq/userspace.c

@@ -113,7 +113,7 @@ int cpufreq_set(unsigned int freq, unsigned int cpu)
 	if (freq > cpu_max_freq[cpu])
 		freq = cpu_max_freq[cpu];
 
-	ret = cpufreq_driver_target_l(&current_policy[cpu], freq, 
+	ret = cpufreq_driver_target(&current_policy[cpu], freq, 
 	      CPUFREQ_RELATION_L);
 
  err:

include/linux/cpufreq.h

@@ -70,6 +70,8 @@ struct cpufreq_policy {
 	struct cpufreq_cpuinfo  cpuinfo;     /* see above */
 	struct device		* dev;
 	struct kobject		kobj;
+ 	struct semaphore	lock;   /* CPU ->setpolicy or ->target may
+					   only be called once a time */
 };
 
 #define CPUFREQ_ADJUST          (0)
@@ -132,18 +134,13 @@ struct cpufreq_governor {
 };
 
 /* pass a target to the cpufreq driver 
- * _l : (cpufreq_driver_sem is not held)
  */
 inline int cpufreq_driver_target(struct cpufreq_policy *policy,
 				 unsigned int target_freq,
 				 unsigned int relation);
 
-inline int cpufreq_driver_target_l(struct cpufreq_policy *policy,
-				   unsigned int target_freq,
-				   unsigned int relation);
-
 /* pass an event to the cpufreq governor */
-int cpufreq_governor_l(unsigned int cpu, unsigned int event);
+int cpufreq_governor(unsigned int cpu, unsigned int event);
 
 int cpufreq_register_governor(struct cpufreq_governor *governor);
 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
@@ -165,6 +162,7 @@ struct cpufreq_driver {
 	int	(*target)	(struct cpufreq_policy *policy,
 				 unsigned int target_freq,
 				 unsigned int relation);
+	struct module           *owner;
 	/* optional, for the moment */
 	int	(*init)		(struct cpufreq_policy *policy);
 	int	(*exit)		(struct cpufreq_policy *policy);