tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git for-usb-next
head:   a90f619386a961d42cde656b13e4c22c133cc775
commit: a62595355b40c10d1fcc7056ddcf4c246fc72967 [2/4] xhci: use generic command timer for stop endpoint commands.
config: arm-randconfig-c002-20211121 (attached as .config)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git/commit/?id=a62595355b40c10d1fcc7056ddcf4c246fc72967
        git remote add mnyman-xhci https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git
        git fetch --no-tags mnyman-xhci for-usb-next
        git checkout a62595355b40c10d1fcc7056ddcf4c246fc72967
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/usb/host/xhci-ring.c:1236:6: warning: no previous prototype for function 'xhci_handle_stop_endpoint_command_timeout' [-Wmissing-prototypes]
   void xhci_handle_stop_endpoint_command_timeout(struct xhci_hcd *xhci, struct xhci_command *cmd)
        ^
   drivers/usb/host/xhci-ring.c:1236:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void xhci_handle_stop_endpoint_command_timeout(struct xhci_hcd *xhci, struct xhci_command *cmd)
   ^
   static 
   1 warning generated.


vim +/xhci_handle_stop_endpoint_command_timeout +1236 drivers/usb/host/xhci-ring.c

  1235	
> 1236	void xhci_handle_stop_endpoint_command_timeout(struct xhci_hcd *xhci, struct xhci_command *cmd)
  1237	{
  1238		struct xhci_virt_ep	*ep;
  1239		u32			usbsts;
  1240		u32			field3;
  1241		char			str[XHCI_MSG_MAX];
  1242	
  1243		field3 = le32_to_cpu(cmd->command_trb->generic.field[3]);
  1244		usbsts = readl(&xhci->op_regs->status);
  1245	
  1246		xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n");
  1247		xhci_warn(xhci, "USBSTS:%s\n", xhci_decode_usbsts(str, usbsts));
  1248	
  1249		ep = xhci_get_virt_ep(xhci,
  1250				      TRB_TO_SLOT_ID(field3),
  1251				      TRB_TO_EP_INDEX(field3));
  1252		if (ep)
  1253			ep->ep_state &= ~EP_STOP_CMD_PENDING;
  1254	
  1255		xhci_halt(xhci);
  1256		xhci_hc_died(xhci);
  1257	
  1258		xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, "xHCI host controller is dead.");
  1259	}
  1260	

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