Hi Heikki,

I love your patch! Yet something to improve:

[auto build test ERROR on peter.chen-usb/for-usb-next]
[also build test ERROR on linus/master v5.12-rc4 next-20210325]
[cannot apply to usb/usb-testing chrome-platform-linux/for-next balbi-usb/testing/next]
[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/Heikki-Krogerus/usb-Linking-ports-to-their-Type-C-connectors/20210325-203239
base:   https://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git for-usb-next
config: i386-randconfig-a015-20210325 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/3f5d8681c4754fba373563812803b8d5eb11639a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Heikki-Krogerus/usb-Linking-ports-to-their-Type-C-connectors/20210325-203239
        git checkout 3f5d8681c4754fba373563812803b8d5eb11639a
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   ld: drivers/usb/typec/port-mapper.o: in function `typec_link_ports':

quoted

drivers/usb/typec/port-mapper.c:260: undefined reference to `usb_for_each_port'

vim +260 drivers/usb/typec/port-mapper.c

   251	
   252	int typec_link_ports(struct typec_port *con)
   253	{
   254		int ret;
   255	
   256		con->pld = get_pld(&con->dev);
   257		if (!con->pld)
   258			return 0;
   259	
 > 260		ret = usb_for_each_port(&con->dev, connector_match);
   261		if (ret)
   262			typec_unlink_ports(con);
   263	
   264		return ret;
   265	}
   266	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org