xiaoxiang781216 commented on code in PR #17010:
URL: https://github.com/apache/nuttx/pull/17010#discussion_r2348096371
##########
drivers/usbdev/cdcacm.c:
##########
@@ -3430,8 +3430,53 @@ void cdcacm_uninitialize(FAR struct usbdevclass_driver_s
*classdev)
{
FAR struct cdcacm_driver_s *drvr = (FAR struct cdcacm_driver_s *)classdev;
FAR struct cdcacm_dev_s *priv = drvr->dev;
- char devname[CDCACM_DEVNAME_SIZE];
+
+ cdcacm_uninitialize_instance(priv->minor, classdev);
+}
+
+/****************************************************************************
+ * Name: cdcacm_uninitialize_instance
+ *
+ * Description:
+ * Function to uninitialize specific cdcacm instance
+ *
+ * Input Parameters:
+ * minor - CDCACM node minor number
+ *
+ * Returned Value:
+ * OK when successful, -ENODEV if cdcacm is not initialized
+ *
+ ****************************************************************************/
+
+int cdcacm_uninitialize_instance(int minor,
+ FAR struct usbdevclass_driver_s *classdev)
+{
int ret;
+ FAR struct cdcacm_driver_s *drvr = (FAR struct cdcacm_driver_s *)classdev;
+ FAR struct cdcacm_dev_s *priv;
+ char devname[CDCACM_DEVNAME_SIZE];
+
+ /* Create device node path from minor number */
+
+ snprintf(devname, sizeof(devname), CDCACM_DEVNAME_FORMAT, minor);
+
+ /* If classdev is not provided, find it from the file system */
+
+ if (!classdev)
+ {
+ FAR struct cdcacm_alloc_s *cdcacm_alloc = find_driver(devname);
+ if (cdcacm_alloc)
+ {
+ drvr = &cdcacm_alloc->drvr;
Review Comment:
should we return inode with refcount like find_blockdriver to avoid other
threads destroy the driver to make drv pointer stale.
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