On Wed, 2018-10-03 at 19:20 +0800, yhchuang@xxxxxxxxxxx wrote: > > +static struct dentry *debugfs_topdir; > + > +void rtw_debugfs_init(struct rtw_dev *rtwdev) > +{ > + debugfs_topdir = debugfs_create_dir("rtw88", NULL); You really can't do this, all hell will break lose if you ever plug two devices into the same system. johannes