From 23d328994b548d6822b88fe7e1903652afc354e0 Mon Sep 17 00:00:00 2001 From: "Srivatsa S. Bhat" Date: Tue, 30 Jul 2013 04:23:56 +0530 Subject: [PATCH] cpufreq: Fix misplaced call to cpufreq_update_policy() The call to cpufreq_update_policy() is placed in the CPU hotplug callback of cpufreq_stats, which has a higher priority than the CPU hotplug callback of cpufreq-core. As a result, during CPU_ONLINE/CPU_ONLINE_FROZEN, we end up calling cpufreq_update_policy() *before* calling cpufreq_add_dev() ! And for uninitialized CPUs, it just returns silently, not doing anything. To add to that, cpufreq_stats is not even the right place to call cpufreq_update_policy() to begin with. The cpufreq core ought to handle this in its own callback, from an elegance/relevance perspective. So move the invocation of cpufreq_update_policy() to cpufreq_cpu_callback, and place it *after* cpufreq_add_dev(). Signed-off-by: Srivatsa S. Bhat Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 1 + drivers/cpufreq/cpufreq_stats.c | 6 ------ 2 files changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index f0a5e2b0eb8a..5b317b0db902 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1945,6 +1945,7 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb, case CPU_ONLINE: case CPU_ONLINE_FROZEN: cpufreq_add_dev(dev, NULL); + cpufreq_update_policy(cpu); break; case CPU_DOWN_PREPARE: case CPU_DOWN_PREPARE_FROZEN: diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index d37568c5ca9c..bc73be225be5 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -348,10 +348,6 @@ static int cpufreq_stat_cpu_callback(struct notifier_block *nfb, unsigned int cpu = (unsigned long)hcpu; switch (action) { - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - cpufreq_update_policy(cpu); - break; case CPU_DOWN_PREPARE: case CPU_DOWN_PREPARE_FROZEN: cpufreq_stats_free_sysfs(cpu); @@ -390,8 +386,6 @@ static int __init cpufreq_stats_init(void) return ret; register_hotcpu_notifier(&cpufreq_stat_cpu_notifier); - for_each_online_cpu(cpu) - cpufreq_update_policy(cpu); ret = cpufreq_register_notifier(¬ifier_trans_block, CPUFREQ_TRANSITION_NOTIFIER); -- 2.30.2