Hi "Uwe, I love your patch! Perhaps something to improve: [auto build test WARNING on usb/usb-testing] [also build test WARNING on v5.15-rc6 next-20211018] [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/Uwe-Kleine-K-nig/usb-max-3421-Us... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing config: i386-randconfig-r025-20211018 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d245f2e8597bfb52c34810a328d42b990e4af1a4) 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 # https://github.com/0day-ci/linux/commit/9ee7ff2f570093a02d9ae5e402a5becfd... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Uwe-Kleine-K-nig/usb-max-3421-Use-driver-data-instead-of-maintaining-a-list-of-bound-devices/20211018-200133 git checkout 9ee7ff2f570093a02d9ae5e402a5becfdf87b9f5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): INIT_LIST_HEAD(&max3421_hcd->ep_list); ^~~~~~~~~~~ drivers/usb/host/max3421-hcd.c:1827:33: note: initialize the variable 'max3421_hcd' to silence this warning struct max3421_hcd *max3421_hcd; ^ = NULL 1 warning generated. vim +/max3421_hcd +1880 drivers/usb/host/max3421-hcd.c 721fdc83b31b1b Jules Maselbas 2017-09-15 1822 2d53139f31626b David Mosberger 2014-04-28 1823 static int 2d53139f31626b David Mosberger 2014-04-28 1824 max3421_probe(struct spi_device *spi) 2d53139f31626b David Mosberger 2014-04-28 1825 { 721fdc83b31b1b Jules Maselbas 2017-09-15 1826 struct device *dev = &spi->dev; 2d53139f31626b David Mosberger 2014-04-28 1827 struct max3421_hcd *max3421_hcd; 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1828 struct usb_hcd *hcd = NULL; 721fdc83b31b1b Jules Maselbas 2017-09-15 1829 struct max3421_hcd_platform_data *pdata = NULL; 5a569343e8a618 Yang Yingliang 2020-11-17 1830 int retval; 2d53139f31626b David Mosberger 2014-04-28 1831 2d53139f31626b David Mosberger 2014-04-28 1832 if (spi_setup(spi) < 0) { 2d53139f31626b David Mosberger 2014-04-28 1833 dev_err(&spi->dev, "Unable to setup SPI bus"); 2d53139f31626b David Mosberger 2014-04-28 1834 return -EFAULT; 2d53139f31626b David Mosberger 2014-04-28 1835 } 2d53139f31626b David Mosberger 2014-04-28 1836 721fdc83b31b1b Jules Maselbas 2017-09-15 1837 if (!spi->irq) { 721fdc83b31b1b Jules Maselbas 2017-09-15 1838 dev_err(dev, "Failed to get SPI IRQ"); 721fdc83b31b1b Jules Maselbas 2017-09-15 1839 return -EFAULT; 721fdc83b31b1b Jules Maselbas 2017-09-15 1840 } 721fdc83b31b1b Jules Maselbas 2017-09-15 1841 721fdc83b31b1b Jules Maselbas 2017-09-15 1842 if (IS_ENABLED(CONFIG_OF) && dev->of_node) { 721fdc83b31b1b Jules Maselbas 2017-09-15 1843 pdata = devm_kzalloc(&spi->dev, sizeof(*pdata), GFP_KERNEL); 721fdc83b31b1b Jules Maselbas 2017-09-15 1844 if (!pdata) { 721fdc83b31b1b Jules Maselbas 2017-09-15 1845 retval = -ENOMEM; 721fdc83b31b1b Jules Maselbas 2017-09-15 1846 goto error; 721fdc83b31b1b Jules Maselbas 2017-09-15 1847 } 721fdc83b31b1b Jules Maselbas 2017-09-15 1848 retval = max3421_of_vbus_en_pin(dev, pdata); 721fdc83b31b1b Jules Maselbas 2017-09-15 1849 if (retval) 721fdc83b31b1b Jules Maselbas 2017-09-15 1850 goto error; 721fdc83b31b1b Jules Maselbas 2017-09-15 1851 721fdc83b31b1b Jules Maselbas 2017-09-15 1852 spi->dev.platform_data = pdata; 721fdc83b31b1b Jules Maselbas 2017-09-15 1853 } 721fdc83b31b1b Jules Maselbas 2017-09-15 1854 721fdc83b31b1b Jules Maselbas 2017-09-15 1855 pdata = spi->dev.platform_data; 721fdc83b31b1b Jules Maselbas 2017-09-15 1856 if (!pdata) { 721fdc83b31b1b Jules Maselbas 2017-09-15 1857 dev_err(&spi->dev, "driver configuration data is not provided\n"); 721fdc83b31b1b Jules Maselbas 2017-09-15 1858 retval = -EFAULT; 721fdc83b31b1b Jules Maselbas 2017-09-15 1859 goto error; 721fdc83b31b1b Jules Maselbas 2017-09-15 1860 } 721fdc83b31b1b Jules Maselbas 2017-09-15 1861 if (pdata->vbus_active_level > 1) { 721fdc83b31b1b Jules Maselbas 2017-09-15 1862 dev_err(&spi->dev, "vbus active level value %d is out of range (0/1)\n", pdata->vbus_active_level); 721fdc83b31b1b Jules Maselbas 2017-09-15 1863 retval = -EINVAL; 721fdc83b31b1b Jules Maselbas 2017-09-15 1864 goto error; 721fdc83b31b1b Jules Maselbas 2017-09-15 1865 } 721fdc83b31b1b Jules Maselbas 2017-09-15 1866 if (pdata->vbus_gpout < 1 || pdata->vbus_gpout > MAX3421_GPOUT_COUNT) { 721fdc83b31b1b Jules Maselbas 2017-09-15 1867 dev_err(&spi->dev, "vbus gpout value %d is out of range (1..8)\n", pdata->vbus_gpout); 721fdc83b31b1b Jules Maselbas 2017-09-15 1868 retval = -EINVAL; 721fdc83b31b1b Jules Maselbas 2017-09-15 1869 goto error; 721fdc83b31b1b Jules Maselbas 2017-09-15 1870 } 721fdc83b31b1b Jules Maselbas 2017-09-15 1871 5a569343e8a618 Yang Yingliang 2020-11-17 1872 retval = -ENOMEM; 2d53139f31626b David Mosberger 2014-04-28 1873 hcd = usb_create_hcd(&max3421_hcd_desc, &spi->dev, 2d53139f31626b David Mosberger 2014-04-28 1874 dev_name(&spi->dev)); 2d53139f31626b David Mosberger 2014-04-28 1875 if (!hcd) { 2d53139f31626b David Mosberger 2014-04-28 1876 dev_err(&spi->dev, "failed to create HCD structure\n"); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1877 goto error; 2d53139f31626b David Mosberger 2014-04-28 1878 } 2d53139f31626b David Mosberger 2014-04-28 1879 set_bit(HCD_FLAG_POLL_RH, &hcd->flags); 2d53139f31626b David Mosberger 2014-04-28 @1880 INIT_LIST_HEAD(&max3421_hcd->ep_list); 9ee7ff2f570093 Uwe Kleine-König 2021-10-18 1881 spi_set_drvdata(spi, max3421_hcd); 2d53139f31626b David Mosberger 2014-04-28 1882 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1883 max3421_hcd->tx = kmalloc(sizeof(*max3421_hcd->tx), GFP_KERNEL); 13dcf780059417 Wolfram Sang 2016-08-25 1884 if (!max3421_hcd->tx) 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1885 goto error; 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1886 max3421_hcd->rx = kmalloc(sizeof(*max3421_hcd->rx), GFP_KERNEL); 13dcf780059417 Wolfram Sang 2016-08-25 1887 if (!max3421_hcd->rx) 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1888 goto error; 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1889 2d53139f31626b David Mosberger 2014-04-28 1890 max3421_hcd->spi_thread = kthread_run(max3421_spi_thread, hcd, 2d53139f31626b David Mosberger 2014-04-28 1891 "max3421_spi_thread"); 2d53139f31626b David Mosberger 2014-04-28 1892 if (max3421_hcd->spi_thread == ERR_PTR(-ENOMEM)) { 2d53139f31626b David Mosberger 2014-04-28 1893 dev_err(&spi->dev, 2d53139f31626b David Mosberger 2014-04-28 1894 "failed to create SPI thread (out of memory)\n"); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1895 goto error; 2d53139f31626b David Mosberger 2014-04-28 1896 } 2d53139f31626b David Mosberger 2014-04-28 1897 2d53139f31626b David Mosberger 2014-04-28 1898 retval = usb_add_hcd(hcd, 0, 0); 2d53139f31626b David Mosberger 2014-04-28 1899 if (retval) { 2d53139f31626b David Mosberger 2014-04-28 1900 dev_err(&spi->dev, "failed to add HCD\n"); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1901 goto error; 2d53139f31626b David Mosberger 2014-04-28 1902 } 2d53139f31626b David Mosberger 2014-04-28 1903 2d53139f31626b David Mosberger 2014-04-28 1904 retval = request_irq(spi->irq, max3421_irq_handler, 2d53139f31626b David Mosberger 2014-04-28 1905 IRQF_TRIGGER_LOW, "max3421", hcd); 2d53139f31626b David Mosberger 2014-04-28 1906 if (retval < 0) { 2d53139f31626b David Mosberger 2014-04-28 1907 dev_err(&spi->dev, "failed to request irq %d\n", spi->irq); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1908 goto error; 2d53139f31626b David Mosberger 2014-04-28 1909 } 2d53139f31626b David Mosberger 2014-04-28 1910 return 0; 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1911 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1912 error: 721fdc83b31b1b Jules Maselbas 2017-09-15 1913 if (IS_ENABLED(CONFIG_OF) && dev->of_node && pdata) { 721fdc83b31b1b Jules Maselbas 2017-09-15 1914 devm_kfree(&spi->dev, pdata); 721fdc83b31b1b Jules Maselbas 2017-09-15 1915 spi->dev.platform_data = NULL; 721fdc83b31b1b Jules Maselbas 2017-09-15 1916 } 721fdc83b31b1b Jules Maselbas 2017-09-15 1917 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1918 if (hcd) { 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1919 kfree(max3421_hcd->tx); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1920 kfree(max3421_hcd->rx); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1921 if (max3421_hcd->spi_thread) 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1922 kthread_stop(max3421_hcd->spi_thread); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1923 usb_put_hcd(hcd); 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1924 } 05dfa5c9bc3793 David Mosberger-Tang 2014-05-28 1925 return retval; 2d53139f31626b David Mosberger 2014-04-28 1926 } 2d53139f31626b David Mosberger 2014-04-28 1927 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org