On Wed, Mar 31, 2021 at 09:41:22AM -0700, Guenter Roeck wrote: > > diff --git a/include/linux/usb.h b/include/linux/usb.h > > index ddd2f5b2a2827..ebcd03d835d04 100644 > > --- a/include/linux/usb.h > > +++ b/include/linux/usb.h > > @@ -882,6 +882,15 @@ extern struct usb_host_interface *usb_find_alt_setting( > > unsigned int iface_num, > > unsigned int alt_num); > > > > +#ifdef CONFIG_USB > > #if IS_ENABLED(CONFIG_USB) Thanks Guenter. > > +int usb_for_each_port(void *data, int (*fn)(struct device *, void *)); > > +#else > > +static inline int usb_for_each_port(void *data, int (*fn)(struct device *, void *)) > > +{ > > + return 0; > > +} > > +#endif > > + > > /* port claiming functions */ > > int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, > > struct usb_dev_state *owner); > > -- heikki