Index: /trunk/src/VBox/Devices/Audio/DevHDA.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/DevHDA.cpp	(revision 64858)
+++ /trunk/src/VBox/Devices/Audio/DevHDA.cpp	(revision 64859)
@@ -722,4 +722,5 @@
 } HDASTREAM, *PHDASTREAM;
 
+#ifdef VBOX_WITH_HDA_ASYNC_IO
 typedef struct HDASTREAMTHREADCTX
 {
@@ -727,4 +728,5 @@
     PHDASTREAM pStream;
 } HDASTREAMTHREADCTX, *PHDASTREAMTHREADCTX;
+#endif
 
 /**
@@ -4514,7 +4516,7 @@
  * @returns IPRT status code.
  * @param   pThis               HDA state.
- * @param   pStream             HDA stream to write.
- * @param   cbToWrite           Number of bytes to write.
- * @param   pcbWritten          Number of bytes written. Optional.
+ * @param   pStream             HDA stream to read from.
+ * @param   cbToRead            Number of bytes to read.
+ * @param   pcbRead             Number of bytes read. Optional.
  */
 static int hdaStreamRead(PHDASTATE pThis, PHDASTREAM pStream, uint32_t cbToRead, uint32_t *pcbRead)
@@ -4566,5 +4568,5 @@
  * @returns IPRT status code.
  * @param   pThis               HDA state.
- * @param   pStream             HDA stream to write.
+ * @param   pStream             HDA stream to write to.
  * @param   cbToWrite           Number of bytes to write.
  * @param   pcbWritten          Number of bytes written. Optional.