linux-kernel - [PATCH 2/2] cpufreq: don't call cpufreq_update

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Date:	Fri, 14 Feb 2014 16:30:41 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...ysocki.net
Cc:	linaro-kernel@...ts.linaro.org, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	pierre-list@...man.eu, Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH 2/2] cpufreq: don't call cpufreq_update_policy() on CPU addition

cpufreq_update_policy() is called from two places currently. From a workqueue
handled queued from cpufreq_bp_resume() for boot CPU and from
cpufreq_cpu_callback() whenever a CPU is added.

The first one makes sure that boot CPU is running on the frequency present in
policy->cpu. But we don't really need a call from cpufreq_cpu_callback(),
because we always call cpufreq_driver->init() (which will set policy->cur
correctly) whenever first CPU of any policy is added back. And so every policy
structure is guaranteed to have the right frequency in policy->cur.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/cpufreq.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 383362b..b6eb4ed 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2194,7 +2194,6 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb,
 		switch (action & ~CPU_TASKS_FROZEN) {
 		case CPU_ONLINE:
 			__cpufreq_add_dev(dev, NULL, frozen);
-			cpufreq_update_policy(cpu);
 			break;

 		case CPU_DOWN_PREPARE:
-- 
1.7.12.rc2.18.g61b472e

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