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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-03-13 19:18:39 -0400 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2012-03-14 14:45:03 -0400 |
| commit | a7b422cda5084db7265c3b23310a959b43b47529 (patch) | |
| tree | 32cb3e1dbde6b23814cc4e9c432db92754e89679 /drivers/cpufreq | |
| parent | 562a6cbe1cf2edf0a87a659eb26095400322430e (diff) | |
| download | linux-stable-a7b422cda5084db7265c3b23310a959b43b47529.tar.gz linux-stable-a7b422cda5084db7265c3b23310a959b43b47529.tar.bz2 linux-stable-a7b422cda5084db7265c3b23310a959b43b47529.zip | |
provide disable_cpufreq() function to disable the API.
useful for disabling cpufreq altogether. The cpu frequency
scaling drivers and cpu frequency governors will fail to register.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 622013fb7890..7f2f149ae40f 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -126,6 +126,15 @@ static int __init init_cpufreq_transition_notifier_list(void) } pure_initcall(init_cpufreq_transition_notifier_list); +static int off __read_mostly; +int cpufreq_disabled(void) +{ + return off; +} +void disable_cpufreq(void) +{ + off = 1; +} static LIST_HEAD(cpufreq_governor_list); static DEFINE_MUTEX(cpufreq_governor_mutex); @@ -1441,6 +1450,9 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, { int retval = -EINVAL; + if (cpufreq_disabled()) + return -ENODEV; + pr_debug("target for CPU %u: %u kHz, relation %u\n", policy->cpu, target_freq, relation); if (cpu_online(policy->cpu) && cpufreq_driver->target) @@ -1549,6 +1561,9 @@ int cpufreq_register_governor(struct cpufreq_governor *governor) if (!governor) return -EINVAL; + if (cpufreq_disabled()) + return -ENODEV; + mutex_lock(&cpufreq_governor_mutex); err = -EBUSY; @@ -1572,6 +1587,9 @@ void cpufreq_unregister_governor(struct cpufreq_governor *governor) if (!governor) return; + if (cpufreq_disabled()) + return; + #ifdef CONFIG_HOTPLUG_CPU for_each_present_cpu(cpu) { if (cpu_online(cpu)) @@ -1814,6 +1832,9 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) unsigned long flags; int ret; + if (cpufreq_disabled()) + return -ENODEV; + if (!driver_data || !driver_data->verify || !driver_data->init || ((!driver_data->setpolicy) && (!driver_data->target))) return -EINVAL; @@ -1901,6 +1922,9 @@ static int __init cpufreq_core_init(void) { int cpu; + if (cpufreq_disabled()) + return -ENODEV; + for_each_possible_cpu(cpu) { per_cpu(cpufreq_policy_cpu, cpu) = -1; init_rwsem(&per_cpu(cpu_policy_rwsem, cpu)); |