Merge tag 'pm+acpi-fixes-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management fixes from Rafael Wysocki:

 - Fixes for blackfin and microblaze build problems introduced by the
   removal of global pm_idle.  From Lars-Peter Clausen.

 - OPP core build fix from Shawn Guo.

 - Error condition check fix for the new imx6q-cpufreq driver from Wei
   Yongjun.

 - Fix for an AER driver crash related to the lack of APEI
   initialization for acpi=off.  From Rafael J Wysocki.

 - Fix for a USB breakage on Thinkpad T430 related to ACPI power
   resources and PCI wakeup from Rafael J.  Wysocki.

* tag 'pm+acpi-fixes-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / PM: Take unusual configurations of power resources into account
  imx6q-cpufreq: fix return value check in imx6q_cpufreq_probe()
  PM / OPP: fix condition for empty of_init_opp_table()
  ACPI / APEI: Fix crash in apei_hest_parse() for acpi=off
  microblaze idle: Fix compile error
  blackfin idle: Fix compile error

4 files changed, 95 insertions, 33 deletions

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",