From 08d42f39fed326a74fa2062cfc663ca41ee71148 Mon Sep 17 00:00:00 2001 Message-Id: <08d42f39fed326a74fa2062cfc663ca41ee71148.1398335331.git.viresh.kumar@linaro.org> From: Viresh Kumar Date: Thu, 24 Apr 2014 15:58:50 +0530 Subject: [PATCH] cpufreq: add smp_mb()s to cpufreq transitions Signed-off-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index abda660..7198e23 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -355,10 +355,12 @@ void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, struct cpufreq_freqs *freqs) { wait: + smp_mb(); wait_event(policy->transition_wait, !policy->transition_ongoing); spin_lock(&policy->transition_lock); + smp_mb(); if (unlikely(policy->transition_ongoing)) { spin_unlock(&policy->transition_lock); goto wait; @@ -380,8 +382,11 @@ void cpufreq_freq_transition_end(struct cpufreq_policy *policy, cpufreq_notify_post_transition(policy, freqs, transition_failed); + smp_mb(); + policy->transition_ongoing = false; + smp_mb(); wake_up(&policy->transition_wait); } EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); -- 1.7.12.rc2.18.g61b472e