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authorViresh Kumar <viresh.kumar@linaro.org>2017-02-22 13:58:52 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-02-23 23:05:58 +0100
commitd08d1b27fe2a7f6923952613f5fab56ae47a6f5b (patch)
treecf82606bab0956cd4cf48ada2aa2cff2addbca4a /drivers/base
parente84b4a84e52d4cd8770b4242cd09df0133333f63 (diff)
downloadlinux-d08d1b27fe2a7f6923952613f5fab56ae47a6f5b.tar.bz2
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>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/qos.c50
1 files changed, 4 insertions, 46 deletions
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.