diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index 5d611c6..0d918d9 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -2817,6 +2817,14 @@
             if (out->usecase == USECASE_AUDIO_PLAYBACK_MMAP) {
                 do_stop = out->playback_started;
                 out->playback_started = false;
+
+                if (out->mmap_shared_memory_fd >= 0) {
+                    ALOGV("%s: closing mmap_shared_memory_fd = %d",
+                          __func__, out->mmap_shared_memory_fd);
+                    close(out->mmap_shared_memory_fd);
+                    out->mmap_shared_memory_fd = -1;
+                }
+
             }
         } else {
             stop_compressed_output_l(out);
@@ -3989,6 +3997,9 @@
         // Fall back to non exclusive mode
         info->shared_memory_fd = pcm_get_poll_fd(out->pcm);
     } else {
+        out->mmap_shared_memory_fd = info->shared_memory_fd; // for closing later
+        ALOGV("%s: opened mmap_shared_memory_fd = %d", __func__, out->mmap_shared_memory_fd);
+
         if (mmap_size < buffer_size) {
             step = "mmap";
             goto exit;
@@ -4122,6 +4133,14 @@
         if (in->usecase == USECASE_AUDIO_RECORD_MMAP) {
             do_stop = in->capture_started;
             in->capture_started = false;
+
+            if (in->mmap_shared_memory_fd >= 0) {
+                ALOGV("%s: closing mmap_shared_memory_fd = %d",
+                      __func__, in->mmap_shared_memory_fd);
+                close(in->mmap_shared_memory_fd);
+                in->mmap_shared_memory_fd = -1;
+            }
+
         }
         if (in->pcm) {
             pcm_close(in->pcm);
@@ -4718,6 +4737,9 @@
         // Fall back to non exclusive mode
         info->shared_memory_fd = pcm_get_poll_fd(in->pcm);
     } else {
+        in->mmap_shared_memory_fd = info->shared_memory_fd; // for closing later
+        ALOGV("%s: opened mmap_shared_memory_fd = %d", __func__, in->mmap_shared_memory_fd);
+
         if (mmap_size < buffer_size) {
             step = "mmap";
             goto exit;
@@ -4930,6 +4952,7 @@
     out->dev = adev;
     out->handle = handle;
     out->a2dp_compress_mute = false;
+    out->mmap_shared_memory_fd = -1; // not open
 
     /* Init use case and pcm_config */
     if ((is_hdmi || is_usb_dev) &&
@@ -5893,6 +5916,7 @@
     in->flags = flags;
     in->direction = MIC_DIRECTION_UNSPECIFIED;
     in->zoom = 0;
+    in->mmap_shared_memory_fd = -1; // not open
     list_init(&in->aec_list);
     list_init(&in->ns_list);
 
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 54ee72c..15cfa60 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -234,6 +234,7 @@
     bool muted;
     uint64_t written; /* total frames written, not cleared when entering standby */
     int64_t mmap_time_offset_nanos; /* fudge factor to correct inaccuracies in DSP */
+    int     mmap_shared_memory_fd; /* file descriptor associated with MMAP NOIRQ shared memory */
     audio_io_handle_t handle;
 
     int non_blocking;
@@ -293,6 +294,7 @@
     int64_t frames_read; /* total frames read, not cleared when entering standby */
     int64_t frames_muted; /* total frames muted, not cleared when entering standby */
     int64_t mmap_time_offset_nanos; /* fudge factor to correct inaccuracies in DSP */
+    int     mmap_shared_memory_fd; /* file descriptor associated with MMAP NOIRQ shared memory */
 
     audio_io_handle_t capture_handle;
     audio_input_flags_t flags;