jlaitine commented on code in PR #17010:
URL: https://github.com/apache/nuttx/pull/17010#discussion_r2344659956


##########
boards/boardctl.c:
##########
@@ -133,16 +133,25 @@ static inline int
             case BOARDIOC_USBDEV_CONNECT:    /* Connect the CDC/ACM device */
 #ifndef CONFIG_CDCACM_COMPOSITE
               {
-                DEBUGASSERT(ctrl->handle != NULL);
                 ret = cdcacm_initialize(ctrl->instance, ctrl->handle);
               }
 #endif
               break;
 
             case BOARDIOC_USBDEV_DISCONNECT: /* Disconnect the CDC/ACM device 
*/
               {
-                DEBUGASSERT(ctrl->handle != NULL && *ctrl->handle != NULL);
-                cdcacm_uninitialize(*ctrl->handle);
+#ifdef CONFIG_SYSTEM_CDCACM
+                if (ctrl->instance == CONFIG_SYSTEM_CDCACM_DEVMINOR)
+                  {
+                    ret = cdcacm_uninitialize_system_cdcacm();
+                  }
+                else
+#endif
+                  {
+                    DEBUGASSERT(ctrl->handle != NULL &&
+                                *ctrl->handle != NULL);
+                    cdcacm_uninitialize(*ctrl->handle);

Review Comment:
   Of course; it would be possible to dig out the handle from the filesystem, 
by using the "instance" number ("x"), generating the filename "/dev/ttyACMx", 
finding the inode and finally using inode->priv. I just feel that it is 
unnecessarily complex for this purpose. Again, if someone uses 
"CONFIG_SYSTEM_CDCACM", there is only just one of those, and it is simple to 
store the pointer.



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