linux-kernel - [PATCH v2 01/10] drivers base/arch_topology: free cpumask cpus_to

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Message-Id: <20170706094948.8779-2-dietmar.eggemann@arm.com>
Date:   Thu,  6 Jul 2017 10:49:39 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-pm@...r.kernel.org, linux@....linux.org.uk,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Juri Lelli <juri.lelli@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Subject: [PATCH v2 01/10] drivers base/arch_topology: free cpumask cpus_to_visit

Free cpumask cpus_to_visit in case registering
init_cpu_capacity_notifier has failed or the parsing of the cpu
capacity-dmips-mhz property is done. The cpumask cpus_to_visit is
only used inside the notifier call init_cpu_capacity_callback.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Juri Lelli <juri.lelli@....com>
Reported-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
Acked-by: Vincent Guittot <vincent.guittot@...aro.org>
Tested-by: Juri Lelli <juri.lelli@....com>
Reviewed-by: Juri Lelli <juri.lelli@....com>
---
 drivers/base/arch_topology.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index d1c33a85059e..f4832c662762 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -206,6 +206,8 @@ static struct notifier_block init_cpu_capacity_notifier = {
 
 static int __init register_cpufreq_notifier(void)
 {
+	int ret;
+
 	/*
 	 * on ACPI-based systems we need to use the default cpu capacity
 	 * until we have the necessary code to parse the cpu capacity, so
@@ -221,13 +223,19 @@ static int __init register_cpufreq_notifier(void)
 
 	cpumask_copy(cpus_to_visit, cpu_possible_mask);
 
-	return cpufreq_register_notifier(&init_cpu_capacity_notifier,
-					 CPUFREQ_POLICY_NOTIFIER);
+	ret = cpufreq_register_notifier(&init_cpu_capacity_notifier,
+					CPUFREQ_POLICY_NOTIFIER);
+
+	if (ret)
+		free_cpumask_var(cpus_to_visit);
+
+	return ret;
 }
 core_initcall(register_cpufreq_notifier);
 
 static void parsing_done_workfn(struct work_struct *work)
 {
+	free_cpumask_var(cpus_to_visit);
 	cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
 					 CPUFREQ_POLICY_NOTIFIER);
 }
-- 
2.11.0