PM / QoS: Remove global notifiers

They were never used in the kernel, so get rid of them.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 5 insertions, 66 deletions

diff --git a/Documentation/power/pm_qos_interface.txt b/Documentation/power/pm_qos_interface.txt
index 129f7c0e1483..21d2d48f87a2 100644
--- a/Documentation/power/pm_qos_interface.txt
+++ b/Documentation/power/pm_qos_interface.txt
@@ -163,8 +163,7 @@ of flags and remove sysfs attributes pm_qos_no_power_off and pm_qos_remote_wakeu
 under the device's power directory.
 
 Notification mechanisms:
-The per-device PM QoS framework has 2 different and distinct notification trees:
-a per-device notification tree and a global notification tree.
+The per-device PM QoS framework has a per-device notification tree.
 
 int dev_pm_qos_add_notifier(device, notifier):
 Adds a notification callback function for the device.
@@ -174,16 +173,6 @@ is changed (for resume latency device PM QoS only).
 int dev_pm_qos_remove_notifier(device, notifier):
 Removes the notification callback function for the device.
 
-int dev_pm_qos_add_global_notifier(notifier):
-Adds a notification callback function in the global notification tree of the
-framework.
-The callback is called when the aggregated value for any device is changed
-(for resume latency device PM QoS only).
-
-int dev_pm_qos_remove_global_notifier(notifier):
-Removes the notification callback function from the global notification tree
-of the framework.
-
 
 Active state latency tolerance
 
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index d888d9869b6a..271bec73185e 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -17,12 +17,9 @@
  *
  * This QoS design is best effort based. Dependents register their QoS needs.
  * Watchers register to keep track of the current QoS needs of the system.
- * Watchers can register different types of notification callbacks:
- *  . a per-device notification callback using the dev_pm_qos_*_notifier API.
- *    The notification chain data is stored in the per-device constraint
- *    data struct.
- *  . a system-wide notification callback using the dev_pm_qos_*_global_notifier
- *    API. The notification chain data is stored in a static variable.
+ * Watchers can register a per-device notification callback using the
+ * dev_pm_qos_*_notifier API. The notification chain data is stored in the
+ * per-device constraint data struct.
  *
  * Note about the per-device constraint data struct allocation:
  * . The per-device constraints data struct ptr is tored into the device
@@ -49,8 +46,6 @@
 static DEFINE_MUTEX(dev_pm_qos_mtx);
 static DEFINE_MUTEX(dev_pm_qos_sysfs_mtx);
 
-static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers);
-
 /**
  * __dev_pm_qos_flags - Check PM QoS flags for a given device.
  * @dev: Device to check the PM QoS flags for.
@@ -135,8 +130,7 @@ s32 dev_pm_qos_read_value(struct device *dev)
  * @value: Value to assign to the QoS request.
  *
  * Internal function to update the constraints list using the PM QoS core
- * code and if needed call the per-device and the global notification
- * callbacks
+ * code and if needed call the per-device callbacks.
  */
 static int apply_constraint(struct dev_pm_qos_request *req,
                             enum pm_qos_req_action action, s32 value)
@@ -148,12 +142,6 @@ static int apply_constraint(struct dev_pm_qos_request *req,
         case DEV_PM_QOS_RESUME_LATENCY:
                 ret = pm_qos_update_target(&qos->resume_latency,
                                            &req->data.pnode, action, value);
-                if (ret) {
-                        value = pm_qos_read_value(&qos->resume_latency);
-                        blocking_notifier_call_chain(&dev_pm_notifiers,
-                                                     (unsigned long)value,
-                                                     req);
-                }
                 break;
         case DEV_PM_QOS_LATENCY_TOLERANCE:
                 ret = pm_qos_update_target(&qos->latency_tolerance,
@@ -536,36 +524,6 @@ int dev_pm_qos_remove_notifier(struct device *dev,
 EXPORT_SYMBOL_GPL(dev_pm_qos_remove_notifier);
 
 /**
- * dev_pm_qos_add_global_notifier - sets notification entry for changes to
- * target value of the PM QoS constraints for any device
- *
- * @notifier: notifier block managed by caller.
- *
- * Will register the notifier into a notification chain that gets called
- * upon changes to the target value for any device.
- */
-int dev_pm_qos_add_global_notifier(struct notifier_block *notifier)
-{
-        return blocking_notifier_chain_register(&dev_pm_notifiers, notifier);
-}
-EXPORT_SYMBOL_GPL(dev_pm_qos_add_global_notifier);
-
-/**
- * dev_pm_qos_remove_global_notifier - deletes notification for changes to
- * target value of PM QoS constraints for any device
- *
- * @notifier: notifier block to be removed.
- *
- * Will remove the notifier from the notification chain that gets called
- * upon changes to the target value for any device.
- */
-int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier)
-{
-        return blocking_notifier_chain_unregister(&dev_pm_notifiers, notifier);
-}
-EXPORT_SYMBOL_GPL(dev_pm_qos_remove_global_notifier);
-
-/**
  * dev_pm_qos_add_ancestor_request - Add PM QoS request for device's ancestor.
  * @dev: Device whose ancestor to add the request for.
  * @req: Pointer to the preallocated handle.
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index d4d34791e463..3e2547d6e207 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -146,8 +146,6 @@ int dev_pm_qos_add_notifier(struct device *dev,
                             struct notifier_block *notifier);
 int dev_pm_qos_remove_notifier(struct device *dev,
                                struct notifier_block *notifier);
-int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
-int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
 void dev_pm_qos_constraints_init(struct device *dev);
 void dev_pm_qos_constraints_destroy(struct device *dev);
 int dev_pm_qos_add_ancestor_request(struct device *dev,
@@ -199,12 +197,6 @@ static inline int dev_pm_qos_add_notifier(struct device *dev,
 static inline int dev_pm_qos_remove_notifier(struct device *dev,
                                              struct notifier_block *notifier)
                         { return 0; }
-static inline int dev_pm_qos_add_global_notifier(
-                                        struct notifier_block *notifier)
-                        { return 0; }
-static inline int dev_pm_qos_remove_global_notifier(
-                                        struct notifier_block *notifier)
-                        { return 0; }
 static inline void dev_pm_qos_constraints_init(struct device *dev)
 {
         dev->power.power_state = PMSG_ON;