linux-kernel - [PATCH 39/70] cpufreq: interactive: don't handle transition notification if not enabled

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Message-Id: <1445967059-6897-39-git-send-email-czoborbalint@gmail.com>
Date:	Tue, 27 Oct 2015 18:30:27 +0100
From:	Bálint Czobor <czoborbalint@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Todd Poynor <toddpoynor@...gle.com>,
	Bálint Czobor <czoborbalint@...il.com>
Subject: [PATCH 39/70] cpufreq: interactive: don't handle transition notification if not enabled

From: Todd Poynor <toddpoynor@...gle.com>

If multiple governors are in use then avoid processing frequency transition
notifications for CPUs on which the interactive governor is not enabled.

Change-Id: Ibd75255b921d887501a64774a8c4f62302f2d4e4
Reported-by: Francisco Franco <francisco.franco@...udcar.com>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
Signed-off-by: Bálint Czobor <czoborbalint@...il.com>
---
 drivers/cpufreq/cpufreq_interactive.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c
index c8358a3..51c34bf 100644
--- a/drivers/cpufreq/cpufreq_interactive.c
+++ b/drivers/cpufreq/cpufreq_interactive.c
@@ -552,6 +552,12 @@ static int cpufreq_interactive_notifier(
 
 	if (val == CPUFREQ_POSTCHANGE) {
 		pcpu = &per_cpu(cpuinfo, freq->cpu);
+		if (!down_read_trylock(&pcpu->enable_sem))
+			return 0;
+		if (!pcpu->governor_enabled) {
+			up_read(&pcpu->enable_sem);
+			return 0;
+		}
 
 		for_each_cpu(cpu, pcpu->policy->cpus) {
 			struct cpufreq_interactive_cpuinfo *pjcpu =
@@ -560,8 +566,9 @@ static int cpufreq_interactive_notifier(
 			update_load(cpu);
 			spin_unlock(&pjcpu->load_lock);
 		}
-	}
 
+		up_read(&pcpu->enable_sem);
+	}
 	return 0;
 }
 
-- 
1.7.9.5

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