Extern or forward variable declaration at include/linux/usb.h, line 1781 References: drivers/memstick/host/rtsx_usb_ms.c, line 231 drivers/misc/cardreader/rtsx_usb.c, line 41 drivers/misc/cardreader/rtsx_usb.c, line 76 drivers/net/usb/usbnet.c, line 1289 drivers/net/wireless/mediatek/mt76/usb.c, line 430 drivers/net/wireless/mediatek/mt76/usb.c, line 439 drivers/usb/chipidea/udc.c, line 356 drivers/usb/chipidea/udc.c, line 466 drivers/usb/chipidea/udc.c, line 486 drivers/usb/chipidea/udc.c, line 508 drivers/usb/core/devio.c, line 1690 drivers/usb/core/devio.c, line 1698 drivers/usb/core/hcd.c, line 1478 drivers/usb/core/message.c, line 502 drivers/usb/core/message.c, line 563 drivers/usb/core/urb.c, line 474 drivers/usb/host/fotg210-hcd.c, line 2542 drivers/usb/host/ohci-hcd.c, line 120 drivers/usb/host/xhci-ring.c, line 3098 drivers/usb/host/xhci-ring.c, line 3324 drivers/usb/host/xhci.c, line 1304 drivers/usb/host/xhci.c, line 1305 drivers/usb/misc/usbtest.c, line 521 drivers/usb/misc/usbtest.c, line 535 drivers/usb/misc/usbtest.c, line 538 drivers/usb/misc/usbtest.c, line 605 drivers/usb/misc/usbtest.c, line 2185 drivers/usb/usbip/stub_rx.c, line 459 include/linux/usb.h, line 1582 include/linux/usb.h, line 1781 include/linux/usb.h, line 1783 include/linux/usb.h, line 1786 include/linux/usb.h, line 1789 include/linux/usb.h, line 1898