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authorThomas Renninger <trenn@suse.de>2011-03-03 21:31:27 +0100
committerDave Jones <davej@redhat.com>2011-03-16 17:54:32 -0400
commit326c86deaed54ad1b364fcafe5073f563671eb58 (patch)
treefb0784c6450d3d618127df3823ffeeda400ac58f /drivers/cpufreq/cpufreq_ondemand.c
parente8951251b89440644a39f2512b4f265973926b41 (diff)
[CPUFREQ] Remove unneeded locks
There cannot be any concurrent access to these through different cpu sysfs files anymore, because these tunables are now all global (not per cpu). I still have some doubts whether some of these locks were needed at all. Anyway, let's get rid of them. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dave Jones <davej@redhat.com> CC: cpufreq@vger.kernel.org
Diffstat (limited to 'drivers/cpufreq/cpufreq_ondemand.c')
-rw-r--r--drivers/cpufreq/cpufreq_ondemand.c25
1 files changed, 1 insertions, 24 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index ba18205be12b..891360edecdd 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -99,8 +99,7 @@ static DEFINE_PER_CPU(struct cpu_dbs_info_s, od_cpu_dbs_info);
static unsigned int dbs_enable; /* number of CPUs using this policy */
/*
- * dbs_mutex protects data in dbs_tuners_ins from concurrent changes on
- * different CPUs. It protects dbs_enable in governor start/stop.
+ * dbs_mutex protects dbs_enable in governor start/stop.
*/
static DEFINE_MUTEX(dbs_mutex);
@@ -265,11 +264,7 @@ static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
-
- mutex_lock(&dbs_mutex);
dbs_tuners_ins.sampling_rate = max(input, min_sampling_rate);
- mutex_unlock(&dbs_mutex);
-
return count;
}
@@ -282,11 +277,7 @@ static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b,
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
-
- mutex_lock(&dbs_mutex);
dbs_tuners_ins.io_is_busy = !!input;
- mutex_unlock(&dbs_mutex);
-
return count;
}
@@ -301,11 +292,7 @@ static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
input < MIN_FREQUENCY_UP_THRESHOLD) {
return -EINVAL;
}
-
- mutex_lock(&dbs_mutex);
dbs_tuners_ins.up_threshold = input;
- mutex_unlock(&dbs_mutex);
-
return count;
}
@@ -318,7 +305,6 @@ static ssize_t store_sampling_down_factor(struct kobject *a,
if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
return -EINVAL;
- mutex_lock(&dbs_mutex);
dbs_tuners_ins.sampling_down_factor = input;
/* Reset down sampling multiplier in case it was active */
@@ -327,8 +313,6 @@ static ssize_t store_sampling_down_factor(struct kobject *a,
dbs_info = &per_cpu(od_cpu_dbs_info, j);
dbs_info->rate_mult = 1;
}
- mutex_unlock(&dbs_mutex);
-
return count;
}
@@ -347,9 +331,7 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
if (input > 1)
input = 1;
- mutex_lock(&dbs_mutex);
if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */
- mutex_unlock(&dbs_mutex);
return count;
}
dbs_tuners_ins.ignore_nice = input;
@@ -364,8 +346,6 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
}
- mutex_unlock(&dbs_mutex);
-
return count;
}
@@ -382,11 +362,8 @@ static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b,
if (input > 1000)
input = 1000;
- mutex_lock(&dbs_mutex);
dbs_tuners_ins.powersave_bias = input;
ondemand_powersave_bias_init();
- mutex_unlock(&dbs_mutex);
-
return count;
}