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| author | Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> | 2013-07-30 04:23:56 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-08-07 23:02:48 +0200 |
| commit | 23d328994b548d6822b88fe7e1903652afc354e0 (patch) | |
| tree | d2eb8f99ce3d27a1719d8cc86b1802ba85645793 /drivers/cpufreq | |
| parent | c095ba7224d8edc71dcef0d655911399a8bd4a3f (diff) | |
| download | linux-23d328994b548d6822b88fe7e1903652afc354e0.tar.bz2 | |
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 <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 1 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_stats.c | 6 |
2 files changed, 1 insertions, 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); |