1 files changed, 60 insertions, 13 deletions

diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 995e3bd3417b..6a031e684026 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -230,6 +230,21 @@ int pm_qos_request_active(struct pm_qos_request *req)
 EXPORT_SYMBOL_GPL(pm_qos_request_active);
 
 /**
+ * pm_qos_work_fn - the timeout handler of pm_qos_update_request_timeout
+ * @work: work struct for the delayed work (timeout)
+ *
+ * This cancels the timeout request by falling back to the default at timeout.
+ */
+static void pm_qos_work_fn(struct work_struct *work)
+{
+        struct pm_qos_request *req = container_of(to_delayed_work(work),
+                                                  struct pm_qos_request,
+                                                  work);
+
+        pm_qos_update_request(req, PM_QOS_DEFAULT_VALUE);
+}
+
+/**
  * pm_qos_add_request - inserts new qos request into the list
  * @req: pointer to a preallocated handle
  * @pm_qos_class: identifies which list of qos request to use
@@ -253,6 +268,7 @@ void pm_qos_add_request(struct pm_qos_request *req,
                 return;
         }
         req->pm_qos_class = pm_qos_class;
+        INIT_DELAYED_WORK(&req->work, pm_qos_work_fn);
         pm_qos_update_target(pm_qos_array[pm_qos_class]->constraints,
                              &req->node, PM_QOS_ADD_REQ, value);
 }
@@ -279,6 +295,9 @@ void pm_qos_update_request(struct pm_qos_request *req,
                 return;
         }
 
+        if (delayed_work_pending(&req->work))
+                cancel_delayed_work_sync(&req->work);
+
         if (new_value != req->node.prio)
                 pm_qos_update_target(
                         pm_qos_array[req->pm_qos_class]->constraints,
@@ -287,6 +306,34 @@ void pm_qos_update_request(struct pm_qos_request *req,
 EXPORT_SYMBOL_GPL(pm_qos_update_request);
 
 /**
+ * pm_qos_update_request_timeout - modifies an existing qos request temporarily.
+ * @req : handle to list element holding a pm_qos request to use
+ * @new_value: defines the temporal qos request
+ * @timeout_us: the effective duration of this qos request in usecs.
+ *
+ * After timeout_us, this qos request is cancelled automatically.
+ */
+void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value,
+                                   unsigned long timeout_us)
+{
+        if (!req)
+                return;
+        if (WARN(!pm_qos_request_active(req),
+                 "%s called for unknown object.", __func__))
+                return;
+
+        if (delayed_work_pending(&req->work))
+                cancel_delayed_work_sync(&req->work);
+
+        if (new_value != req->node.prio)
+                pm_qos_update_target(
+                        pm_qos_array[req->pm_qos_class]->constraints,
+                        &req->node, PM_QOS_UPDATE_REQ, new_value);
+
+        schedule_delayed_work(&req->work, usecs_to_jiffies(timeout_us));
+}
+
+/**
  * pm_qos_remove_request - modifies an existing qos request
  * @req: handle to request list element
  *
@@ -305,6 +352,9 @@ void pm_qos_remove_request(struct pm_qos_request *req)
                 return;
         }
 
+        if (delayed_work_pending(&req->work))
+                cancel_delayed_work_sync(&req->work);
+
         pm_qos_update_target(pm_qos_array[req->pm_qos_class]->constraints,
                              &req->node, PM_QOS_REMOVE_REQ,
                              PM_QOS_DEFAULT_VALUE);
@@ -469,21 +519,18 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
 static int __init pm_qos_power_init(void)
 {
         int ret = 0;
+        int i;
 
-        ret = register_pm_qos_misc(&cpu_dma_pm_qos);
-        if (ret < 0) {
-                printk(KERN_ERR "pm_qos_param: cpu_dma_latency setup failed\n");
-                return ret;
-        }
-        ret = register_pm_qos_misc(&network_lat_pm_qos);
-        if (ret < 0) {
-                printk(KERN_ERR "pm_qos_param: network_latency setup failed\n");
-                return ret;
+        BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES);
+
+        for (i = 1; i < PM_QOS_NUM_CLASSES; i++) {
+                ret = register_pm_qos_misc(pm_qos_array[i]);
+                if (ret < 0) {
+                        printk(KERN_ERR "pm_qos_param: %s setup failed\n",
+                               pm_qos_array[i]->name);
+                        return ret;
+                }
         }
-        ret = register_pm_qos_misc(&network_throughput_pm_qos);
-        if (ret < 0)
-                printk(KERN_ERR
-                        "pm_qos_param: network_throughput setup failed\n");
 
         return ret;
 }