diff --git a/media/codec2/vndk/include/C2SurfaceSyncObj.h b/media/codec2/vndk/include/C2SurfaceSyncObj.h
index ac87fe4..d858f27 100644
--- a/media/codec2/vndk/include/C2SurfaceSyncObj.h
+++ b/media/codec2/vndk/include/C2SurfaceSyncObj.h
@@ -72,12 +72,13 @@
     /**
      * Notify a buffer is queued. Return whether the upcoming dequeue operation
      * is not blocked. if it's blocked and waitId is non-null, waitId is returned
-     * to be used for waiting.
+     * to be used for waiting. Notify(wake-up) waitors only when 'notify' is
+     * true.
      *
      * \retval false    dequeue operation is blocked now.
      * \retval true     dequeue operation is possible.
      */
-    bool notifyQueuedLocked(uint32_t *waitId = nullptr);
+    bool notifyQueuedLocked(uint32_t *waitId = nullptr, bool notify = true);
 
     /**
      * Notify a buffer is dequeued.
diff --git a/media/codec2/vndk/platform/C2BqBuffer.cpp b/media/codec2/vndk/platform/C2BqBuffer.cpp
index 9960c58..f2cd585 100644
--- a/media/codec2/vndk/platform/C2BqBuffer.cpp
+++ b/media/codec2/vndk/platform/C2BqBuffer.cpp
@@ -440,8 +440,8 @@
             if (status == -ETIME) {
                 // fence is not signalled yet.
                 if (syncVar) {
-                    syncVar->lock();
                     (void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+                    syncVar->lock();
                     dequeueable = syncVar->notifyQueuedLocked(&waitId);
                     syncVar->unlock();
                     if (c2Fence) {
@@ -456,8 +456,8 @@
             if (status != android::NO_ERROR) {
                 ALOGD("buffer fence wait error %d", status);
                 if (syncVar) {
-                    syncVar->lock();
                     (void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+                    syncVar->lock();
                     syncVar->notifyQueuedLocked();
                     syncVar->unlock();
                     if (c2Fence) {
@@ -506,8 +506,8 @@
             } else if (status != android::NO_ERROR) {
                 slotBuffer.clear();
                 if (syncVar) {
-                    syncVar->lock();
                     (void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+                    syncVar->lock();
                     syncVar->notifyQueuedLocked();
                     syncVar->unlock();
                     if (c2Fence) {
@@ -554,8 +554,8 @@
             // Block was not created. call requestBuffer# again next time.
             slotBuffer.clear();
             if (syncVar) {
-                syncVar->lock();
                 (void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+                syncVar->lock();
                 syncVar->notifyQueuedLocked();
                 syncVar->unlock();
                 if (c2Fence) {
@@ -817,11 +817,10 @@
         if (mGeneration == mCurrentGeneration && mBqId == mCurrentBqId && !mOwner.expired()) {
             C2SyncVariables *syncVar = mSyncMem ? mSyncMem->mem() : nullptr;
             if (syncVar) {
+                mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
                 syncVar->lock();
-                if (syncVar->getSyncStatusLocked() == C2SyncVariables::STATUS_ACTIVE) {
-                    mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
-                    syncVar->notifyQueuedLocked();
-                }
+                syncVar->notifyQueuedLocked(nullptr,
+                        syncVar->getSyncStatusLocked() == C2SyncVariables::STATUS_ACTIVE);
                 syncVar->unlock();
             } else {
                 mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
@@ -830,11 +829,10 @@
     } else if (!mOwner.expired()) {
         C2SyncVariables *syncVar = mSyncMem ? mSyncMem->mem() : nullptr;
         if (syncVar) {
+            mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
             syncVar->lock();
-            if (syncVar->getSyncStatusLocked() != C2SyncVariables::STATUS_SWITCHING) {
-                mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
-                syncVar->notifyQueuedLocked();
-            }
+            syncVar->notifyQueuedLocked(nullptr,
+                    syncVar->getSyncStatusLocked() != C2SyncVariables::STATUS_SWITCHING);
             syncVar->unlock();
         } else {
             mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
diff --git a/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp b/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp
index 2115cc3..99bccac 100644
--- a/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp
+++ b/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp
@@ -177,12 +177,14 @@
     return true;
 }
 
-bool C2SyncVariables::notifyQueuedLocked(uint32_t *waitId) {
+bool C2SyncVariables::notifyQueuedLocked(uint32_t *waitId, bool notify) {
     // Note. thundering herds may occur. Edge trigged signalling.
     // But one waiter will guarantee to dequeue. others may wait again.
     // Minimize futex syscall(trap) for the main use case(one waiter case).
     if (mMaxDequeueCount == mCurDequeueCount--) {
-        broadcast();
+        if (notify) {
+            broadcast();
+        }
         return true;
     }