Proper handle for configuration reset

src/device/usbd.c

@@ -703,8 +703,18 @@ static bool process_control_request(uint8_t rhport, tusb_control_request_t const
               _usbd_dev.speed = speed; // restore speed
             }
 
-            // switch to new configuration if not zero
-            if ( cfg_num ) TU_ASSERT( process_set_config(rhport, cfg_num) );
+            // Handle the new configuration and execute the corresponding callback
+            if ( cfg_num )
+            {
+              // switch to new configuration if not zero
+              TU_ASSERT( process_set_config(rhport, cfg_num) );
+
+              if ( tud_mount_cb ) tud_mount_cb();
+            }
+            else
+            {
+              if ( tud_umount_cb ) tud_umount_cb();
+            }
           }
 
           _usbd_dev.cfg_num = cfg_num;
@@ -956,9 +966,6 @@ static bool process_set_config(uint8_t rhport, uint8_t cfg_num)
     TU_ASSERT(drv_id < TOTAL_DRIVER_COUNT);
   }
 
-  // invoke callback
-  if (tud_mount_cb) tud_mount_cb();
-
   return true;
 }