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| author | Viresh Kumar <viresh.kumar@linaro.org> | 2015-10-13 13:39:01 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-10-28 09:20:04 +0100 |
| commit | 083701b13c79a908fb400dc24aaa80aad07ac462 (patch) | |
| tree | 6d7b18c3bbdab77988aff701366c20513420966c /drivers/cpufreq/cpufreq_ondemand.c | |
| parent | 51443fbf3d2cde16011b994252c8004ebcd66fb0 (diff) | |
| download | linux-083701b13c79a908fb400dc24aaa80aad07ac462.tar.gz linux-083701b13c79a908fb400dc24aaa80aad07ac462.tar.bz2 linux-083701b13c79a908fb400dc24aaa80aad07ac462.zip | |
cpufreq: ondemand: Drop unnecessary locks from update_sampling_rate()
'timer_mutex' is required to sync work-handlers of policy->cpus.
update_sampling_rate() is just canceling the works and queuing them
again. This isn't protecting anything at all in update_sampling_rate()
and is not gonna be of any use.
Even if a work-handler is already running for a CPU,
cancel_delayed_work_sync() will wait for it to finish.
Drop these unnecessary locks.
Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq_ondemand.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 1fa9088c84a8..03ac6ce54042 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -267,27 +267,19 @@ static void update_sampling_rate(struct dbs_data *dbs_data, dbs_info = &per_cpu(od_cpu_dbs_info, cpu); cpufreq_cpu_put(policy); - mutex_lock(&dbs_info->cdbs.shared->timer_mutex); - - if (!delayed_work_pending(&dbs_info->cdbs.dwork)) { - mutex_unlock(&dbs_info->cdbs.shared->timer_mutex); + if (!delayed_work_pending(&dbs_info->cdbs.dwork)) continue; - } next_sampling = jiffies + usecs_to_jiffies(new_rate); appointed_at = dbs_info->cdbs.dwork.timer.expires; if (time_before(next_sampling, appointed_at)) { - - mutex_unlock(&dbs_info->cdbs.shared->timer_mutex); cancel_delayed_work_sync(&dbs_info->cdbs.dwork); - mutex_lock(&dbs_info->cdbs.shared->timer_mutex); gov_queue_work(dbs_data, policy, usecs_to_jiffies(new_rate), true); } - mutex_unlock(&dbs_info->cdbs.shared->timer_mutex); } } |