fix(audio): clear stale Feature Unit associations

Reset Feature Unit state when parsing a new audio function. Devices without a matching unit must not inherit an ID collected from an earlier interface or device.

Signed-off-by: HiFiPHile <[email protected]>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/class/audio/audio_host.c b/src/class/audio/audio_host.c
index 338b6d94a..4f4c1e0d0 100644
--- a/src/class/audio/audio_host.c
+++ b/src/class/audio/audio_host.c
@@ -551,9 +551,10 @@ void audioh_close(uint8_t daddr) {
     _audioh_epbuf[idx].complete_cb = NULL; // drop a pending feature-unit request
     _audioh_epbuf[idx].fu_busy     = false;
 
-    p_audio->stream_count = 0;
-    p_audio->daddr        = 0;
-    p_audio->mounted      = false;
+    p_audio->feature_unit_id = 0;
+    p_audio->stream_count    = 0;
+    p_audio->daddr           = 0;
+    p_audio->mounted         = false;
   }
 }
 
@@ -878,6 +879,7 @@ uint16_t audioh_open(uint8_t rhport, uint8_t dev_addr, const tusb_desc_interface
   audioh_interface_t *p_audio = &_audioh_itf[idx];
   p_audio->daddr              = dev_addr;
   p_audio->ac_itf_num         = desc_itf->bInterfaceNumber;
+  p_audio->feature_unit_id    = 0;
   audioh_stream_reset(&p_audio->in_stream);
   audioh_stream_reset(&p_audio->out_stream);
   p_audio->in_stream.daddr  = dev_addr;