BQ: Improved buffer/slot tracking

- Explicitly track active buffers and unused slots on top of the
  already existing tracking for free slots and free buffers.

Change-Id: Ife2678678e96f0eb0b3fb21571058378134bd868

1 files changed, 7 insertions, 0 deletions

diff --git a/libs/gui/Surface.cpp b/libs/gui/Surface.cpp
index 9e90ad0f5c..6fc55c344e 100644
--- a/libs/gui/Surface.cpp
+++ b/libs/gui/Surface.cpp
@@ -759,6 +759,13 @@ int Surface::detachNextBuffer(sp<GraphicBuffer>* outBuffer,
         *outFence = Fence::NO_FENCE;
     }
 
+    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
+        if (mSlots[i].buffer != NULL &&
+                mSlots[i].buffer->handle == buffer->handle) {
+            mSlots[i].buffer = NULL;
+        }
+    }
+
     return NO_ERROR;
 }