diff --git a/include/gui/CpuConsumer.h b/include/gui/CpuConsumer.h
index 9290676..6f4c2ec 100644
--- a/include/gui/CpuConsumer.h
+++ b/include/gui/CpuConsumer.h
@@ -90,7 +90,7 @@
     // Gets the next graphics buffer from the producer and locks it for CPU use,
     // filling out the passed-in locked buffer structure with the native pointer
     // and metadata. Returns BAD_VALUE if no new buffer is available, and
-    // INVALID_OPERATION if the maximum number of buffers is already locked.
+    // NOT_ENOUGH_DATA if the maximum number of buffers is already locked.
     //
     // Only a fixed number of buffers can be locked at a time, determined by the
     // construction-time maxLockedBuffers parameter. If INVALID_OPERATION is
diff --git a/libs/gui/CpuConsumer.cpp b/libs/gui/CpuConsumer.cpp
index 3db46bc..bff55d1 100644
--- a/libs/gui/CpuConsumer.cpp
+++ b/libs/gui/CpuConsumer.cpp
@@ -72,7 +72,9 @@
 
     if (!nativeBuffer) return BAD_VALUE;
     if (mCurrentLockedBuffers == mMaxLockedBuffers) {
-        return INVALID_OPERATION;
+        CC_LOGW("Max buffers have been locked (%d), cannot lock anymore.",
+                mMaxLockedBuffers);
+        return NOT_ENOUGH_DATA;
     }
 
     BufferQueue::BufferItem b;