Hi Pratham, Thank you for the patch! Yet something to improve: [auto build test ERROR on usb/usb-testing] [also build test ERROR on linus/master peter-chen-usb/for-usb-next v5.16 next-20220118] [cannot apply to 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/Pratham-Pratap/usb-hub-Power-cyc... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing config: alpha-allmodconfig (https://download.01.org/0day-ci/archive/20220120/202201200108.JJYDWfTS-lk...) compiler: alpha-linux-gcc (GCC) 11.2.0 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 # https://github.com/0day-ci/linux/commit/ec4d5f04b268fc19d3b5d2843d1889531... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Pratham-Pratap/usb-hub-Power-cycle-root-hub-if-CSC-is-set-during-hub_port_reset/20220119-235321 git checkout ec4d5f04b268fc19d3b5d2843d1889531dafd22f # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash drivers/usb/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/usb/core/hub.c: In function 'hub_port_wait_reset': 2907 | if (udev->reset_resume && (!udev->parent && hcd->fs_suspend_reset) && | ^~ 2909 | usb_hub_port_power_cycle(hdev, hub, port1); | ^~~~ | udev drivers/usb/core/hub.c:2909:50: note: each undeclared identifier is reported only once for each function it appears in vim +2907 drivers/usb/core/hub.c 2845 2846 static int hub_port_wait_reset(struct usb_hub *hub, int port1, 2847 struct usb_device *udev, unsigned int delay, bool warm) 2848 { 2849 int delay_time, ret; 2850 struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2851 u16 portstatus; 2852 u16 portchange; 2853 u32 ext_portstatus = 0; 2854 2855 for (delay_time = 0; 2856 delay_time < HUB_RESET_TIMEOUT; 2857 delay_time += delay) { 2858 /* wait to give the device a chance to reset */ 2859 msleep(delay); 2860 2861 /* read and decode port status */ 2862 if (hub_is_superspeedplus(hub->hdev)) 2863 ret = hub_ext_port_status(hub, port1, 2864 HUB_EXT_PORT_STATUS, 2865 &portstatus, &portchange, 2866 &ext_portstatus); 2867 else 2868 ret = hub_port_status(hub, port1, &portstatus, 2869 &portchange); 2870 if (ret < 0) 2871 return ret; 2872 2873 /* 2874 * The port state is unknown until the reset completes. 2875 * 2876 * On top of that, some chips may require additional time 2877 * to re-establish a connection after the reset is complete, 2878 * so also wait for the connection to be re-established. 2879 */ 2880 if (!(portstatus & USB_PORT_STAT_RESET) && 2881 (portstatus & USB_PORT_STAT_CONNECTION)) 2882 break; 2883 2884 /* switch to the long delay after two short delay failures */ 2885 if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2886 delay = HUB_LONG_RESET_TIME; 2887 2888 dev_dbg(&hub->ports[port1 - 1]->dev, 2889 "not %sreset yet, waiting %dms\n", 2890 warm ? "warm " : "", delay); 2891 } 2892 2893 if ((portstatus & USB_PORT_STAT_RESET)) 2894 return -EBUSY; 2895 2896 if (hub_port_warm_reset_required(hub, port1, portstatus)) 2897 return -ENOTCONN; 2898 2899 /* Device went away? */ 2900 if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 2901 /* 2902 * When a FS device is following a suspend-reset-enumeration-data_transfer 2903 * sequence, sometimes it goes back in suspend just after reset without the 2904 * link entering L0. To fix this when CSC bit is set(because of CCS status 2905 * change) power cycle the root hub. 2906 */ 2908 (portstatus & USB_PORT_STAT_CSC)) { 2910 return -EAGAIN; 2911 } 2912 2913 return -ENOTCONN; 2914 } 2915 2916 /* Retry if connect change is set but status is still connected. 2917 * A USB 3.0 connection may bounce if multiple warm resets were issued, 2918 * but the device may have successfully re-connected. Ignore it. 2919 */ 2920 if (!hub_is_superspeed(hub->hdev) && 2921 (portchange & USB_PORT_STAT_C_CONNECTION)) { 2922 usb_clear_port_feature(hub->hdev, port1, 2923 USB_PORT_FEAT_C_CONNECTION); 2924 return -EAGAIN; 2925 } 2926 2927 if (!(portstatus & USB_PORT_STAT_ENABLE)) 2928 return -EBUSY; 2929 2930 if (!udev) 2931 return 0; 2932 2933 if (hub_is_superspeedplus(hub->hdev)) { 2934 /* extended portstatus Rx and Tx lane count are zero based */ 2935 udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1; 2936 udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1; 2937 udev->ssp_rate = get_port_ssp_rate(hub->hdev, ext_portstatus); 2938 } else { 2939 udev->rx_lanes = 1; 2940 udev->tx_lanes = 1; 2941 udev->ssp_rate = USB_SSP_GEN_UNKNOWN; 2942 } 2943 if (hub_is_wusb(hub)) 2944 udev->speed = USB_SPEED_WIRELESS; 2945 else if (udev->ssp_rate != USB_SSP_GEN_UNKNOWN) 2946 udev->speed = USB_SPEED_SUPER_PLUS; 2947 else if (hub_is_superspeed(hub->hdev)) 2948 udev->speed = USB_SPEED_SUPER; 2949 else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 2950 udev->speed = USB_SPEED_HIGH; 2951 else if (portstatus & USB_PORT_STAT_LOW_SPEED) 2952 udev->speed = USB_SPEED_LOW; 2953 else 2954 udev->speed = USB_SPEED_FULL; 2955 return 0; 2956 } 2957 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org