usb_devices_root 966 drivers/usb/core/usb.c static struct dentry *usb_devices_root; usb_devices_root 970 drivers/usb/core/usb.c usb_devices_root = debugfs_create_file("devices", 0444, usb_debug_root, usb_devices_root 976 drivers/usb/core/usb.c debugfs_remove(usb_devices_root);