From: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
When disable_cpufreq() is called some exported functions are still
being used that do not have a check for cpufreq being disabled.
Add a disabled check into cpufreq_cpu_get() to return NULL if
cpufreq is disabled this covers most of the exported functions. For
the exported functions that do not call cpufreq_cpu_get() add an
explicit check.
Signed-off-by: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
---
drivers/cpufreq/cpufreq.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 1f93dbd..b7663f7 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -180,6 +180,9 @@ err_out:
struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
{
+ if (cpufreq_disabled())
+ return NULL;
+
return __cpufreq_cpu_get(cpu, false);
}
EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
@@ -198,6 +201,9 @@ static void __cpufreq_cpu_put(struct cpufreq_policy *data, bool sysfs)
void cpufreq_cpu_put(struct cpufreq_policy *data)
{
+ if (cpufreq_disabled())
+ return;
+
__cpufreq_cpu_put(data, false);
}
EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
@@ -264,6 +270,9 @@ void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
BUG_ON(irqs_disabled());
+ if (cpufreq_disabled())
+ return;
+
freqs->flags = cpufreq_driver->flags;
pr_debug("notification %u of frequency transition to %u kHz\n",
state, freqs->new);
@@ -1408,6 +1417,9 @@ int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
{
int ret;
+ if (cpufreq_disabled())
+ return -EINVAL;
+
WARN_ON(!init_cpufreq_transition_notifier_list_called);
switch (list) {
@@ -1442,6 +1454,9 @@ int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
{
int ret;
+ if (cpufreq_disabled())
+ return -EINVAL;
+
switch (list) {
case CPUFREQ_TRANSITION_NOTIFIER:
ret = srcu_notifier_chain_unregister(
@@ -1522,6 +1537,9 @@ int __cpufreq_driver_getavg(struct cpufreq_policy *policy, unsigned int cpu)
{
int ret = 0;
+ if (cpufreq_disabled())
+ return ret;
+
if (!(cpu_online(cpu) && cpufreq_driver->getavg))
return 0;
--
1.7.7.6
--
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