Extern or forward variable declaration at include/linux/usb/hcd.h, line 470 References: drivers/usb/core/hcd-pci.c, line 172 drivers/usb/dwc2/pci.c, line 96 drivers/usb/dwc2/pci.c, line 172 drivers/usb/host/ehci-pci.c, line 37 drivers/usb/host/ehci-pci.c, line 359 drivers/usb/host/ehci-pci.c, line 373 drivers/usb/host/ohci-pci.c, line 178 drivers/usb/host/ohci-pci.c, line 249 drivers/usb/host/ohci-pci.c, line 277 drivers/usb/host/whci/hcd.c, line 348 drivers/usb/host/xhci-pci.c, line 286 drivers/usb/host/xhci-pci.c, line 490 drivers/usb/isp1760/isp1760-if.c, line 125 drivers/usb/isp1760/isp1760-if.c, line 167 include/linux/usb/hcd.h, line 470 include/linux/usb/hcd.h, line 472