2 files changed, 31 insertions, 6 deletions
diff --git a/src/class/midi/midi_device.c b/src/class/midi/midi_device.c
index 052372a93..42905ab0d 100644
--- a/src/class/midi/midi_device.c
+++ b/src/class/midi/midi_device.c
@@ -373,12 +373,10 @@ bool tud_midi_n_packet_write (uint8_t itf, uint8_t const packet[4])
 //--------------------------------------------------------------------+
 // USBD Driver API
 //--------------------------------------------------------------------+
-void midid_init(void)
-{
+void midid_init(void) {
   tu_memclr(_midid_itf, sizeof(_midid_itf));
 
-  for(uint8_t i=0; i<CFG_TUD_MIDI; i++)
-  {
+  for (uint8_t i = 0; i < CFG_TUD_MIDI; i++) {
     midid_interface_t* midi = &_midid_itf[i];
 
     // config fifo
@@ -386,12 +384,38 @@ void midid_init(void)
     tu_fifo_config(&midi->tx_ff, midi->tx_ff_buf, CFG_TUD_MIDI_TX_BUFSIZE, 1, false); // OBVS.
 
     #if CFG_FIFO_MUTEX
-    tu_fifo_config_mutex(&midi->rx_ff, NULL, osal_mutex_create(&midi->rx_ff_mutex));
-    tu_fifo_config_mutex(&midi->tx_ff, osal_mutex_create(&midi->tx_ff_mutex), NULL);
+    osal_mutex_t mutex_rd = osal_mutex_create(&midi->rx_ff_mutex);
+    osal_mutex_t mutex_wr = osal_mutex_create(&midi->tx_ff_mutex);
+    TU_ASSERT(mutex_wr != NULL && mutex_wr != NULL, );
+
+    tu_fifo_config_mutex(&midi->rx_ff, NULL, mutex_rd);
+    tu_fifo_config_mutex(&midi->tx_ff, mutex_wr, NULL);
     #endif
   }
 }
 
+bool midid_deinit(void) {
+  #if CFG_FIFO_MUTEX
+  for(uint8_t i=0; i<CFG_TUD_MIDI; i++) {
+    midid_interface_t* midi = &_midid_itf[i];
+    osal_mutex_t mutex_rd = midi->rx_ff.mutex_rd;
+    osal_mutex_t mutex_wr = midi->tx_ff.mutex_wr;
+
+    if (mutex_rd) {
+      osal_mutex_delete(mutex_rd);
+      tu_fifo_config_mutex(&midi->rx_ff, NULL, NULL);
+    }
+
+    if (mutex_wr) {
+      osal_mutex_delete(mutex_wr);
+      tu_fifo_config_mutex(&midi->tx_ff, NULL, NULL);
+    }
+  }
+  #endif
+
+  return true;
+}
+
 void midid_reset(uint8_t rhport)
 {
   (void) rhport;
diff --git a/src/class/midi/midi_device.h b/src/class/midi/midi_device.h
index 1c6f996be..3e89cc0a3 100644
--- a/src/class/midi/midi_device.h
+++ b/src/class/midi/midi_device.h
@@ -158,6 +158,7 @@ static inline bool tud_midi_packet_write (uint8_t const packet[4])
 // Internal Class Driver API
 //--------------------------------------------------------------------+
 void     midid_init            (void);
+bool     midid_deinit          (void);
 void     midid_reset           (uint8_t rhport);
 uint16_t midid_open            (uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
 bool     midid_control_xfer_cb (uint8_t rhport, uint8_t stage, tusb_control_request_t const * request);