diff --git a/libs/gui/BufferQueueProducer.cpp b/libs/gui/BufferQueueProducer.cpp
index 69a408c..be3b6c3 100644
--- a/libs/gui/BufferQueueProducer.cpp
+++ b/libs/gui/BufferQueueProducer.cpp
@@ -553,44 +553,53 @@
     ATRACE_CALL();
     ATRACE_BUFFER_INDEX(slot);
     BQ_LOGV("detachBuffer: slot %d", slot);
-    Mutex::Autolock lock(mCore->mMutex);
 
-    if (mCore->mIsAbandoned) {
-        BQ_LOGE("detachBuffer: BufferQueue has been abandoned");
-        return NO_INIT;
+    sp<IConsumerListener> listener;
+    {
+        Mutex::Autolock lock(mCore->mMutex);
+
+        if (mCore->mIsAbandoned) {
+            BQ_LOGE("detachBuffer: BufferQueue has been abandoned");
+            return NO_INIT;
+        }
+
+        if (mCore->mConnectedApi == BufferQueueCore::NO_CONNECTED_API) {
+            BQ_LOGE("detachBuffer: BufferQueue has no connected producer");
+            return NO_INIT;
+        }
+
+        if (mCore->mSharedBufferMode || mCore->mSharedBufferSlot == slot) {
+            BQ_LOGE("detachBuffer: cannot detach a buffer in shared buffer mode");
+            return BAD_VALUE;
+        }
+
+        if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
+            BQ_LOGE("detachBuffer: slot index %d out of range [0, %d)",
+                    slot, BufferQueueDefs::NUM_BUFFER_SLOTS);
+            return BAD_VALUE;
+        } else if (!mSlots[slot].mBufferState.isDequeued()) {
+            BQ_LOGE("detachBuffer: slot %d is not owned by the producer "
+                    "(state = %s)", slot, mSlots[slot].mBufferState.string());
+            return BAD_VALUE;
+        } else if (!mSlots[slot].mRequestBufferCalled) {
+            BQ_LOGE("detachBuffer: buffer in slot %d has not been requested",
+                    slot);
+            return BAD_VALUE;
+        }
+
+        mSlots[slot].mBufferState.detachProducer();
+        mCore->mActiveBuffers.erase(slot);
+        mCore->mFreeSlots.insert(slot);
+        mCore->clearBufferSlotLocked(slot);
+        mCore->mDequeueCondition.broadcast();
+        VALIDATE_CONSISTENCY();
+        listener = mCore->mConsumerListener;
     }
 
-    if (mCore->mConnectedApi == BufferQueueCore::NO_CONNECTED_API) {
-        BQ_LOGE("detachBuffer: BufferQueue has no connected producer");
-        return NO_INIT;
+    if (listener != NULL) {
+        listener->onBuffersReleased();
     }
 
-    if (mCore->mSharedBufferMode || mCore->mSharedBufferSlot == slot) {
-        BQ_LOGE("detachBuffer: cannot detach a buffer in shared buffer mode");
-        return BAD_VALUE;
-    }
-
-    if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
-        BQ_LOGE("detachBuffer: slot index %d out of range [0, %d)",
-                slot, BufferQueueDefs::NUM_BUFFER_SLOTS);
-        return BAD_VALUE;
-    } else if (!mSlots[slot].mBufferState.isDequeued()) {
-        BQ_LOGE("detachBuffer: slot %d is not owned by the producer "
-                "(state = %s)", slot, mSlots[slot].mBufferState.string());
-        return BAD_VALUE;
-    } else if (!mSlots[slot].mRequestBufferCalled) {
-        BQ_LOGE("detachBuffer: buffer in slot %d has not been requested",
-                slot);
-        return BAD_VALUE;
-    }
-
-    mSlots[slot].mBufferState.detachProducer();
-    mCore->mActiveBuffers.erase(slot);
-    mCore->mFreeSlots.insert(slot);
-    mCore->clearBufferSlotLocked(slot);
-    mCore->mDequeueCondition.broadcast();
-    VALIDATE_CONSISTENCY();
-
     return NO_ERROR;
 }