Merge with rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

[karo-tx-linux.git] / drivers / cpufreq / cpufreq_ondemand.c

diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index e69fd8dd1f1cb7bf6042a878b2545a714c7df133..9ee9411f186f9b8738f4a7320991f058576733d7 100644 (file)
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -27,6 +27,7 @@
 #include <linux/jiffies.h>
 #include <linux/kernel_stat.h>
 #include <linux/percpu.h>
+#include <linux/mutex.h>
 
 /*
  * dbs is used in this file as a shortform for demandbased switching
@@ -70,7 +71,7 @@ static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
 static unsigned int dbs_enable;        /* number of CPUs using this policy */
 
-static DECLARE_MUTEX   (dbs_sem);
+static DEFINE_MUTEX    (dbs_mutex);
 static DECLARE_WORK    (dbs_work, do_dbs_timer, NULL);
 
 struct dbs_tuners {
@@ -136,9 +137,9 @@ static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
        if (input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
                return -EINVAL;
 
-       down(&dbs_sem);
+       mutex_lock(&dbs_mutex);
        dbs_tuners_ins.sampling_down_factor = input;
-       up(&dbs_sem);
+       mutex_unlock(&dbs_mutex);
 
        return count;
 }
@@ -150,14 +151,14 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
        int ret;
        ret = sscanf (buf, "%u", &input);
 
-       down(&dbs_sem);
+       mutex_lock(&dbs_mutex);
        if (ret != 1 || input > MAX_SAMPLING_RATE || input < MIN_SAMPLING_RATE) {
-               up(&dbs_sem);
+               mutex_unlock(&dbs_mutex);
                return -EINVAL;
        }
 
        dbs_tuners_ins.sampling_rate = input;
-       up(&dbs_sem);
+       mutex_unlock(&dbs_mutex);
 
        return count;
 }
@@ -169,15 +170,15 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused,
        int ret;
        ret = sscanf (buf, "%u", &input);
 
-       down(&dbs_sem);
+       mutex_lock(&dbs_mutex);
        if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || 
                        input < MIN_FREQUENCY_UP_THRESHOLD) {
-               up(&dbs_sem);
+               mutex_unlock(&dbs_mutex);
                return -EINVAL;
        }
 
        dbs_tuners_ins.up_threshold = input;
-       up(&dbs_sem);
+       mutex_unlock(&dbs_mutex);
 
        return count;
 }
@@ -197,9 +198,9 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
        if ( input > 1 )
                input = 1;
        
-       down(&dbs_sem);
+       mutex_lock(&dbs_mutex);
        if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */
-               up(&dbs_sem);
+               mutex_unlock(&dbs_mutex);
                return count;
        }
        dbs_tuners_ins.ignore_nice = input;
@@ -211,7 +212,7 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
                j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(j);
                j_dbs_info->prev_cpu_idle_down = j_dbs_info->prev_cpu_idle_up;
        }
-       up(&dbs_sem);
+       mutex_unlock(&dbs_mutex);
 
        return count;
 }
@@ -356,12 +357,12 @@ static void dbs_check_cpu(int cpu)
 static void do_dbs_timer(void *data)
 { 
        int i;
-       down(&dbs_sem);
+       mutex_lock(&dbs_mutex);
        for_each_online_cpu(i)
                dbs_check_cpu(i);
        schedule_delayed_work(&dbs_work, 
                        usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
-       up(&dbs_sem);
+       mutex_unlock(&dbs_mutex);
 } 
 
 static inline void dbs_timer_init(void)
@@ -399,7 +400,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                if (this_dbs_info->enable) /* Already enabled */
                        break;
                 
-               down(&dbs_sem);
+               mutex_lock(&dbs_mutex);
                for_each_cpu_mask(j, policy->cpus) {
                        struct cpu_dbs_info_s *j_dbs_info;
                        j_dbs_info = &per_cpu(cpu_dbs_info, j);
@@ -435,11 +436,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                        dbs_timer_init();
                }
                
-               up(&dbs_sem);
+               mutex_unlock(&dbs_mutex);
                break;
 
        case CPUFREQ_GOV_STOP:
-               down(&dbs_sem);
+               mutex_lock(&dbs_mutex);
                this_dbs_info->enable = 0;
                sysfs_remove_group(&policy->kobj, &dbs_attr_group);
                dbs_enable--;
@@ -450,12 +451,12 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                if (dbs_enable == 0) 
                        dbs_timer_exit();
                
-               up(&dbs_sem);
+               mutex_unlock(&dbs_mutex);
 
                break;
 
        case CPUFREQ_GOV_LIMITS:
-               down(&dbs_sem);
+               mutex_lock(&dbs_mutex);
                if (policy->max < this_dbs_info->cur_policy->cur)
                        __cpufreq_driver_target(
                                        this_dbs_info->cur_policy,
@@ -464,7 +465,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                        __cpufreq_driver_target(
                                        this_dbs_info->cur_policy,
                                        policy->min, CPUFREQ_RELATION_L);
-               up(&dbs_sem);
+               mutex_unlock(&dbs_mutex);
                break;
        }
        return 0;