[balbi-usb:testing/next 17/22] drivers/usb/dwc3/drd.c:604: undefined reference to `usb_role_switch_unregister'

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git testing/next
head:   bad6c1502dac79c80ad5a7149fa308849c0191dd
commit: 24e2238d8c102f242ece57f45fbeb4014929aad4 [17/22] usb: dwc3: drd: Register a USB role switch
config: x86_64-randconfig-s4-11151335 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 24e2238d8c102f242ece57f45fbeb4014929aad4
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/usb/dwc3/drd.o: In function `dwc3_drd_exit':
>> drivers/usb/dwc3/drd.c:604: undefined reference to `usb_role_switch_unregister'
   drivers/usb/dwc3/drd.o: In function `dwc3_drd_init':
>> drivers/usb/dwc3/drd.c:563: undefined reference to `usb_role_switch_register'
>> drivers/usb/dwc3/drd.c:563: undefined reference to `usb_role_switch_register'

vim +604 drivers/usb/dwc3/drd.c

   514	
   515	int dwc3_drd_init(struct dwc3 *dwc)
   516	{
   517		int ret, irq;
   518	
   519		dwc->edev = dwc3_get_extcon(dwc);
   520		if (IS_ERR(dwc->edev))
   521			return PTR_ERR(dwc->edev);
   522	
   523		if (dwc->edev) {
   524			dwc->edev_nb.notifier_call = dwc3_drd_notifier;
   525			ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
   526						       &dwc->edev_nb);
   527			if (ret < 0) {
   528				dev_err(dwc->dev, "couldn't register cable notifier\n");
   529				return ret;
   530			}
   531	
   532			dwc3_drd_update(dwc);
   533		} else {
   534			dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
   535			dwc->current_dr_role = DWC3_GCTL_PRTCAP_OTG;
   536	
   537			/* use OTG block to get ID event */
   538			irq = dwc3_otg_get_irq(dwc);
   539			if (irq < 0)
   540				return irq;
   541	
   542			dwc->otg_irq = irq;
   543	
   544			/* disable all OTG IRQs */
   545			dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
   546			/* clear all events */
   547			dwc3_otg_clear_events(dwc);
   548	
   549			ret = request_threaded_irq(dwc->otg_irq, dwc3_otg_irq,
   550						   dwc3_otg_thread_irq,
   551						   IRQF_SHARED, "dwc3-otg", dwc);
   552			if (ret) {
   553				dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
   554					dwc->otg_irq, ret);
   555				ret = -ENODEV;
   556				return ret;
   557			}
   558	
   559			dwc3_otg_init(dwc);
   560			dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
   561		}
   562	
 > 563		dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
   564		if (ret) {
   565			dwc3_drd_exit(dwc);
   566			return PTR_ERR(dwc->role_sw);
   567		}
   568		return 0;
   569	}
   570	
   571	void dwc3_drd_exit(struct dwc3 *dwc)
   572	{
   573		unsigned long flags;
   574	
   575		if (dwc->edev)
   576			extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
   577						   &dwc->edev_nb);
   578	
   579		cancel_work_sync(&dwc->drd_work);
   580	
   581		/* debug user might have changed role, clean based on current role */
   582		switch (dwc->current_dr_role) {
   583		case DWC3_GCTL_PRTCAP_HOST:
   584			dwc3_host_exit(dwc);
   585			break;
   586		case DWC3_GCTL_PRTCAP_DEVICE:
   587			dwc3_gadget_exit(dwc);
   588			dwc3_event_buffers_cleanup(dwc);
   589			break;
   590		case DWC3_GCTL_PRTCAP_OTG:
   591			dwc3_otg_exit(dwc);
   592			spin_lock_irqsave(&dwc->lock, flags);
   593			dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE;
   594			spin_unlock_irqrestore(&dwc->lock, flags);
   595			dwc3_otg_update(dwc, 1);
   596			break;
   597		default:
   598			break;
   599		}
   600	
   601		if (!dwc->edev)
   602			free_irq(dwc->otg_irq, dwc);
   603	
 > 604		usb_role_switch_unregister(dwc->role_sw);

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