On Wed, Jul 21, 2021 at 08:46:17AM +0800, kernel test robot wrote:
> Hi Matthias,
> 
> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on usb/usb-testing]
> [also build test ERROR on robh/for-next driver-core/driver-core-testing linus/master v5.14-rc2 next-20210720]
> [cannot apply to char-misc/char-misc-testing]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:    https://github.com/0day-ci/linux/commits/Matthias-Kaehlcke/usb-misc-Add-onboard_usb_hub-driver/20210720-144614
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> config: i386-randconfig-a003-20210720 (attached as .config)
> compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
> reproduce (this is a W=1 build):
>         # https://github.com/0day-ci/linux/commit/1ac4caccda0f2e6904b0e1462bc9735c690d719f
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Matthias-Kaehlcke/usb-misc-Add-onboard_usb_hub-driver/20210720-144614
>         git checkout 1ac4caccda0f2e6904b0e1462bc9735c690d719f
>         # save the attached .config to linux build tree
>         mkdir build_dir
>         make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>    ld: drivers/usb/dwc3/core.o: in function `dwc3_resume_common':
> >> drivers/usb/dwc3/core.c:1853: undefined reference to `dwc3_gadget_resume'
>    ld: drivers/usb/dwc3/core.o: in function `dwc3_runtime_resume':
> >> drivers/usb/dwc3/core.c:1912: undefined reference to `dwc3_gadget_process_pending_events'
>    ld: drivers/usb/dwc3/core.o: in function `dwc3_suspend_common':
> >> drivers/usb/dwc3/core.c:1750: undefined reference to `dwc3_gadget_suspend'

What happened here is that USB_DWC3 was selected, but one of USB_DWC3_HOST,
USB_DWC3_GADGET or USB_DWC3_DUAL_ROLE.

Typically one of them would be selected by:

  choice
          bool "DWC3 Mode Selection"
          default USB_DWC3_DUAL_ROLE if (USB && USB_GADGET)
          default USB_DWC3_HOST if (USB && !USB_GADGET)
          default USB_DWC3_GADGET if (!USB && USB_GADGET)

In this case USB_XHCI_PLATFORM is not set (previously it would be selected
by USB_DWC3) and USB_DWC3_HOST (and USB_DWC3_DUAL_ROLE) now depends on it.

The following change should fix this:

  config USB_DWC3
 -        depends on (USB || USB_GADGET) && HAS_DMA
 +        depends on (USB && USB_XHCI_PLATFORM) || USB_GADGET)) && HAS_DMA