From 326c86deaed54ad1b364fcafe5073f563671eb58 Mon Sep 17 00:00:00 2001 From: Thomas Renninger Date: Thu, 3 Mar 2011 21:31:27 +0100 Subject: [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 Signed-off-by: Dave Jones CC: cpufreq@vger.kernel.org --- drivers/cpufreq/cpufreq_conservative.c | 34 +++++----------------------------- 1 file changed, 5 insertions(+), 29 deletions(-) (limited to 'drivers/cpufreq/cpufreq_conservative.c') diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index 3182d85b3374..33b56e5c5c14 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -76,8 +76,7 @@ static DEFINE_PER_CPU(struct cpu_dbs_info_s, cs_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); @@ -195,10 +194,7 @@ 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; - mutex_unlock(&dbs_mutex); - return count; } @@ -212,10 +208,7 @@ static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, 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; } @@ -226,16 +219,11 @@ static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, int ret; ret = sscanf(buf, "%u", &input); - mutex_lock(&dbs_mutex); if (ret != 1 || input > 100 || - input <= dbs_tuners_ins.down_threshold) { - mutex_unlock(&dbs_mutex); + input <= dbs_tuners_ins.down_threshold) return -EINVAL; - } dbs_tuners_ins.up_threshold = input; - mutex_unlock(&dbs_mutex); - return count; } @@ -246,17 +234,12 @@ static ssize_t store_down_threshold(struct kobject *a, struct attribute *b, int ret; ret = sscanf(buf, "%u", &input); - mutex_lock(&dbs_mutex); /* cannot be lower than 11 otherwise freq will not fall */ if (ret != 1 || input < 11 || input > 100 || - input >= dbs_tuners_ins.up_threshold) { - mutex_unlock(&dbs_mutex); + input >= dbs_tuners_ins.up_threshold) return -EINVAL; - } dbs_tuners_ins.down_threshold = input; - mutex_unlock(&dbs_mutex); - return count; } @@ -275,11 +258,9 @@ 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); + if (input == dbs_tuners_ins.ignore_nice) /* nothing to do */ return count; - } + dbs_tuners_ins.ignore_nice = input; /* we need to re-evaluate prev_cpu_idle */ @@ -291,8 +272,6 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, if (dbs_tuners_ins.ignore_nice) dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice; } - mutex_unlock(&dbs_mutex); - return count; } @@ -311,10 +290,7 @@ static ssize_t store_freq_step(struct kobject *a, struct attribute *b, /* no need to test here if freq_step is zero as the user might actually * want this, they would be crazy though :) */ - mutex_lock(&dbs_mutex); dbs_tuners_ins.freq_step = input; - mutex_unlock(&dbs_mutex); - return count; } -- cgit v1.2.3