diff --git a/usb/ddk/host/src/ddk_uevent_queue.cpp b/usb/ddk/host/src/ddk_uevent_queue.cpp
index 2c30cb09bc6d745643c2e2ed18e95758ae30b447..5c1a316a46e6c715cf4c13a22aa5e40bac4c6573 100644
--- a/usb/ddk/host/src/ddk_uevent_queue.cpp
+++ b/usb/ddk/host/src/ddk_uevent_queue.cpp
@@ -161,8 +161,7 @@ void TaskQueue::Init(void)
             if (taskQueue_.size() > 0) {
                 DdkUeventTaskInfo task = taskQueue_.front();
                 taskQueue_.pop();
-                queueLock_.unlock();
-                conditionVariable_.notify_one();
+                uniqueLock.unlock();
                 DdkDispatchUevent(&task);
             }
         }
@@ -195,6 +194,7 @@ int32_t TaskQueue::AddTask(const DdkUeventTaskInfo &task)
     std::lock_guard<std::mutex> lock(queueLock_);
     if (taskQueue_.size() > MAX_TASK_NUM) {
         HDF_LOGE("%{public}s: task queue is full", __func__);
+        conditionVariable_.notify_one();
         return HDF_FAILURE;
     }
     taskQueue_.emplace(task);