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-rw-r--r--arch/blackfin/kernel/process.c4
-rw-r--r--arch/microblaze/kernel/process.c5
-rw-r--r--drivers/acpi/apei/hest.c5
-rw-r--r--drivers/acpi/internal.h2
-rw-r--r--drivers/acpi/power.c112
-rw-r--r--drivers/acpi/scan.c9
-rw-r--r--drivers/cpufreq/imx6q-cpufreq.c2
-rw-r--r--include/linux/opp.h18
8 files changed, 107 insertions, 50 deletions
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index 8061426b7df5..9782c0329c14 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -80,12 +80,10 @@ void cpu_idle(void)
if (cpu_is_offline(smp_processor_id()))
cpu_die();
#endif
- if (!idle)
- idle = default_idle;
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched())
- idle();
+ default_idle();
rcu_idle_exit();
tick_nohz_idle_exit();
preempt_enable_no_resched();
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 6ff2dcff3410..08f87343f8d0 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -97,13 +97,10 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- if (!idle)
- idle = default_idle;
-
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched())
- idle();
+ default_idle();
rcu_idle_exit();
tick_nohz_idle_exit();
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 7f00cf38098f..f5ef5d54e4ac 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -89,7 +89,7 @@ int apei_hest_parse(apei_hest_func_t func, void *data)
struct acpi_hest_header *hest_hdr;
int i, rc, len;
- if (hest_disable)
+ if (hest_disable || !hest_tab)
return -EINVAL;
hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
@@ -216,9 +216,6 @@ void __init acpi_hest_init(void)
return;
}
- if (acpi_disabled)
- goto err;
-
status = acpi_get_table(ACPI_SIG_HEST, 0,
(struct acpi_table_header **)&hest_tab);
if (status == AE_NOT_FOUND)
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index c8b70b5b2814..3c94a732b4b3 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -71,7 +71,7 @@ int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
struct list_head *list);
int acpi_add_power_resource(acpi_handle handle);
void acpi_power_add_remove_device(struct acpi_device *adev, bool add);
-int acpi_power_min_system_level(struct list_head *list);
+int acpi_power_wakeup_list_init(struct list_head *list, int *system_level);
int acpi_device_sleep_wake(struct acpi_device *dev,
int enable, int sleep_state, int dev_state);
int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index b820528a5fa3..34f5ef11d427 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -73,6 +73,7 @@ struct acpi_power_resource {
u32 system_level;
u32 order;
unsigned int ref_count;
+ bool wakeup_enabled;
struct mutex resource_lock;
};
@@ -272,11 +273,9 @@ static int __acpi_power_on(struct acpi_power_resource *resource)
return 0;
}
-static int acpi_power_on(struct acpi_power_resource *resource)
+static int acpi_power_on_unlocked(struct acpi_power_resource *resource)
{
- int result = 0;;
-
- mutex_lock(&resource->resource_lock);
+ int result = 0;
if (resource->ref_count++) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
@@ -293,9 +292,16 @@ static int acpi_power_on(struct acpi_power_resource *resource)
schedule_work(&dep->work);
}
}
+ return result;
+}
- mutex_unlock(&resource->resource_lock);
+static int acpi_power_on(struct acpi_power_resource *resource)
+{
+ int result;
+ mutex_lock(&resource->resource_lock);
+ result = acpi_power_on_unlocked(resource);
+ mutex_unlock(&resource->resource_lock);
return result;
}
@@ -313,17 +319,15 @@ static int __acpi_power_off(struct acpi_power_resource *resource)
return 0;
}
-static int acpi_power_off(struct acpi_power_resource *resource)
+static int acpi_power_off_unlocked(struct acpi_power_resource *resource)
{
int result = 0;
- mutex_lock(&resource->resource_lock);
-
if (!resource->ref_count) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Power resource [%s] already off",
resource->name));
- goto unlock;
+ return 0;
}
if (--resource->ref_count) {
@@ -335,10 +339,16 @@ static int acpi_power_off(struct acpi_power_resource *resource)
if (result)
resource->ref_count++;
}
+ return result;
+}
- unlock:
- mutex_unlock(&resource->resource_lock);
+static int acpi_power_off(struct acpi_power_resource *resource)
+{
+ int result;
+ mutex_lock(&resource->resource_lock);
+ result = acpi_power_off_unlocked(resource);
+ mutex_unlock(&resource->resource_lock);
return result;
}
@@ -521,18 +531,35 @@ void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
}
}
-int acpi_power_min_system_level(struct list_head *list)
+int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
{
struct acpi_power_resource_entry *entry;
int system_level = 5;
list_for_each_entry(entry, list, node) {
struct acpi_power_resource *resource = entry->resource;
+ acpi_handle handle = resource->device.handle;
+ int result;
+ int state;
+ mutex_lock(&resource->resource_lock);
+
+ result = acpi_power_get_state(handle, &state);
+ if (result) {
+ mutex_unlock(&resource->resource_lock);
+ return result;
+ }
+ if (state == ACPI_POWER_RESOURCE_STATE_ON) {
+ resource->ref_count++;
+ resource->wakeup_enabled = true;
+ }
if (system_level > resource->system_level)
system_level = resource->system_level;
+
+ mutex_unlock(&resource->resource_lock);
}
- return system_level;
+ *system_level_p = system_level;
+ return 0;
}
/* --------------------------------------------------------------------------
@@ -610,6 +637,7 @@ int acpi_device_sleep_wake(struct acpi_device *dev,
*/
int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
{
+ struct acpi_power_resource_entry *entry;
int err = 0;
if (!dev || !dev->wakeup.flags.valid)
@@ -620,17 +648,31 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
if (dev->wakeup.prepare_count++)
goto out;
- err = acpi_power_on_list(&dev->wakeup.resources);
- if (err) {
- dev_err(&dev->dev, "Cannot turn wakeup power resources on\n");
- dev->wakeup.flags.valid = 0;
- } else {
- /*
- * Passing 3 as the third argument below means the device may be
- * put into arbitrary power state afterward.
- */
- err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
+ list_for_each_entry(entry, &dev->wakeup.resources, node) {
+ struct acpi_power_resource *resource = entry->resource;
+
+ mutex_lock(&resource->resource_lock);
+
+ if (!resource->wakeup_enabled) {
+ err = acpi_power_on_unlocked(resource);
+ if (!err)
+ resource->wakeup_enabled = true;
+ }
+
+ mutex_unlock(&resource->resource_lock);
+
+ if (err) {
+ dev_err(&dev->dev,
+ "Cannot turn wakeup power resources on\n");
+ dev->wakeup.flags.valid = 0;
+ goto out;
+ }
}
+ /*
+ * Passing 3 as the third argument below means the device may be
+ * put into arbitrary power state afterward.
+ */
+ err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
if (err)
dev->wakeup.prepare_count = 0;
@@ -647,6 +689,7 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
*/
int acpi_disable_wakeup_device_power(struct acpi_device *dev)
{
+ struct acpi_power_resource_entry *entry;
int err = 0;
if (!dev || !dev->wakeup.flags.valid)
@@ -668,10 +711,25 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
if (err)
goto out;
- err = acpi_power_off_list(&dev->wakeup.resources);
- if (err) {
- dev_err(&dev->dev, "Cannot turn wakeup power resources off\n");
- dev->wakeup.flags.valid = 0;
+ list_for_each_entry(entry, &dev->wakeup.resources, node) {
+ struct acpi_power_resource *resource = entry->resource;
+
+ mutex_lock(&resource->resource_lock);
+
+ if (resource->wakeup_enabled) {
+ err = acpi_power_off_unlocked(resource);
+ if (!err)
+ resource->wakeup_enabled = false;
+ }
+
+ mutex_unlock(&resource->resource_lock);
+
+ if (err) {
+ dev_err(&dev->dev,
+ "Cannot turn wakeup power resources off\n");
+ dev->wakeup.flags.valid = 0;
+ break;
+ }
}
out:
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 4be408756adc..5e7e991717d7 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1002,7 +1002,14 @@ static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
if (!list_empty(&wakeup->resources)) {
int sleep_state;
- sleep_state = acpi_power_min_system_level(&wakeup->resources);
+ err = acpi_power_wakeup_list_init(&wakeup->resources,
+ &sleep_state);
+ if (err) {
+ acpi_handle_warn(handle, "Retrieving current states "
+ "of wakeup power resources failed\n");
+ acpi_power_resources_list_free(&wakeup->resources);
+ goto out;
+ }
if (sleep_state < wakeup->sleep_state) {
acpi_handle_warn(handle, "Overriding _PRW sleep state "
"(S%d) by S%d from power resources\n",
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index d6b6ef350cb6..54e336de373b 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -245,7 +245,7 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
arm_reg = devm_regulator_get(cpu_dev, "arm");
pu_reg = devm_regulator_get(cpu_dev, "pu");
soc_reg = devm_regulator_get(cpu_dev, "soc");
- if (!arm_reg || !pu_reg || !soc_reg) {
+ if (IS_ERR(arm_reg) || IS_ERR(pu_reg) || IS_ERR(soc_reg)) {
dev_err(cpu_dev, "failed to get regulators\n");
ret = -ENOENT;
goto put_node;
diff --git a/include/linux/opp.h b/include/linux/opp.h
index 214e0ebcb84d..3aca2b8def33 100644
--- a/include/linux/opp.h
+++ b/include/linux/opp.h
@@ -47,15 +47,6 @@ int opp_enable(struct device *dev, unsigned long freq);
int opp_disable(struct device *dev, unsigned long freq);
struct srcu_notifier_head *opp_get_notifier(struct device *dev);
-
-#ifdef CONFIG_OF
-int of_init_opp_table(struct device *dev);
-#else
-static inline int of_init_opp_table(struct device *dev)
-{
- return -EINVAL;
-}
-#endif /* CONFIG_OF */
#else
static inline unsigned long opp_get_voltage(struct opp *opp)
{
@@ -112,6 +103,15 @@ static inline struct srcu_notifier_head *opp_get_notifier(struct device *dev)
}
#endif /* CONFIG_PM_OPP */
+#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
+int of_init_opp_table(struct device *dev);
+#else
+static inline int of_init_opp_table(struct device *dev)
+{
+ return -EINVAL;
+}
+#endif
+
#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
int opp_init_cpufreq_table(struct device *dev,
struct cpufreq_frequency_table **table);
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