Hi Matthias,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on usb/usb-testing]
[also build test ERROR on balbi-usb/testing/next peter.chen-usb/ci-for-usb-next linus/master v5.9-rc3 next-20200828]
[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-usb_hub_pwr-driver/20200902-042449
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh 

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 >>, old ones prefixed by <<):

>> ERROR: modpost: "usb_port_disable" [drivers/usb/misc/usb_hub_pwr.ko] undefined!
>> ERROR: modpost: "usb_generic_driver_probe" [drivers/usb/misc/usb_hub_pwr.ko] undefined!
>> ERROR: modpost: "usb_generic_driver_resume" [drivers/usb/misc/usb_hub_pwr.ko] undefined!
>> ERROR: modpost: "usb_generic_driver_suspend" [drivers/usb/misc/usb_hub_pwr.ko] undefined!
ERROR: modpost: "__delay" [drivers/net/phy/mdio-cavium.ko] undefined!

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