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authorakpm@osdl.org <akpm@osdl.org>2006-01-14 02:54:22 +0300
committerDave Jones <davej@redhat.com>2006-01-19 00:53:45 +0300
commit3fc54d37ab64733448faf0185e19a80f070eb9e3 (patch)
tree58f373f0e519007795fe58d8663b53bab4cb4feb /drivers/cpufreq/cpufreq_userspace.c
parent7eb9b2f56c9812d03ac63031869bcc42151067b1 (diff)
downloadlinux-3fc54d37ab64733448faf0185e19a80f070eb9e3.tar.xz
[CPUFREQ] Convert drivers/cpufreq semaphores to mutexes.
Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq_userspace.c')
-rw-r--r--drivers/cpufreq/cpufreq_userspace.c25
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index d32bf3593cd3..4d6fa63da598 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -21,6 +21,7 @@
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/sysfs.h>
+#include <linux/mutex.h>
#include <asm/uaccess.h>
@@ -35,7 +36,7 @@ static unsigned int cpu_set_freq[NR_CPUS]; /* CPU freq desired by userspace */
static unsigned int cpu_is_managed[NR_CPUS];
static struct cpufreq_policy current_policy[NR_CPUS];
-static DECLARE_MUTEX (userspace_sem);
+static DEFINE_MUTEX (userspace_mutex);
#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "userspace", msg)
@@ -70,7 +71,7 @@ static int cpufreq_set(unsigned int freq, unsigned int cpu)
dprintk("cpufreq_set for cpu %u, freq %u kHz\n", cpu, freq);
- down(&userspace_sem);
+ mutex_lock(&userspace_mutex);
if (!cpu_is_managed[cpu])
goto err;
@@ -83,16 +84,16 @@ static int cpufreq_set(unsigned int freq, unsigned int cpu)
/*
* We're safe from concurrent calls to ->target() here
- * as we hold the userspace_sem lock. If we were calling
+ * as we hold the userspace_mutex lock. If we were calling
* cpufreq_driver_target, a deadlock situation might occur:
- * A: cpufreq_set (lock userspace_sem) -> cpufreq_driver_target(lock policy->lock)
- * B: cpufreq_set_policy(lock policy->lock) -> __cpufreq_governor -> cpufreq_governor_userspace (lock userspace_sem)
+ * A: cpufreq_set (lock userspace_mutex) -> cpufreq_driver_target(lock policy->lock)
+ * B: cpufreq_set_policy(lock policy->lock) -> __cpufreq_governor -> cpufreq_governor_userspace (lock userspace_mutex)
*/
ret = __cpufreq_driver_target(&current_policy[cpu], freq,
CPUFREQ_RELATION_L);
err:
- up(&userspace_sem);
+ mutex_unlock(&userspace_mutex);
return ret;
}
@@ -134,7 +135,7 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
if (!cpu_online(cpu))
return -EINVAL;
BUG_ON(!policy->cur);
- down(&userspace_sem);
+ mutex_lock(&userspace_mutex);
cpu_is_managed[cpu] = 1;
cpu_min_freq[cpu] = policy->min;
cpu_max_freq[cpu] = policy->max;
@@ -143,20 +144,20 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
sysfs_create_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
dprintk("managing cpu %u started (%u - %u kHz, currently %u kHz)\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu]);
- up(&userspace_sem);
+ mutex_unlock(&userspace_mutex);
break;
case CPUFREQ_GOV_STOP:
- down(&userspace_sem);
+ mutex_lock(&userspace_mutex);
cpu_is_managed[cpu] = 0;
cpu_min_freq[cpu] = 0;
cpu_max_freq[cpu] = 0;
cpu_set_freq[cpu] = 0;
sysfs_remove_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
dprintk("managing cpu %u stopped\n", cpu);
- up(&userspace_sem);
+ mutex_unlock(&userspace_mutex);
break;
case CPUFREQ_GOV_LIMITS:
- down(&userspace_sem);
+ mutex_lock(&userspace_mutex);
cpu_min_freq[cpu] = policy->min;
cpu_max_freq[cpu] = policy->max;
dprintk("limit event for cpu %u: %u - %u kHz, currently %u kHz, last set to %u kHz\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu], cpu_set_freq[cpu]);
@@ -171,7 +172,7 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
CPUFREQ_RELATION_L);
}
memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
- up(&userspace_sem);
+ mutex_unlock(&userspace_mutex);
break;
}
return 0;