Extern or forward variable declaration at include/linux/usb.h, line 1769 References: drivers/gpu/drm/udl/udl_dmabuf.c, line 69 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 1323 drivers/net/wireless/mediatek/mt76/usb.c, line 329 drivers/net/wireless/mediatek/mt76/usb.c, line 338 drivers/staging/wusbcore/host/whci/qset.c, line 254 drivers/staging/wusbcore/host/whci/qset.c, line 427 drivers/staging/wusbcore/host/whci/qset.c, line 553 drivers/staging/wusbcore/wa-xfer.c, line 1005 drivers/staging/wusbcore/wa-xfer.c, line 1005 drivers/staging/wusbcore/wa-xfer.c, line 1009 drivers/staging/wusbcore/wa-xfer.c, line 1012 drivers/staging/wusbcore/wa-xfer.c, line 1013 drivers/staging/wusbcore/wa-xfer.c, line 1039 drivers/usb/core/devio.c, line 1676 drivers/usb/core/devio.c, line 1684 drivers/usb/core/hcd.c, line 1476 drivers/usb/core/message.c, line 368 drivers/usb/core/message.c, line 429 drivers/usb/core/urb.c, line 459 drivers/usb/host/fotg210-hcd.c, line 2544 drivers/usb/host/ohci-hcd.c, line 120 drivers/usb/host/xhci-ring.c, line 3046 drivers/usb/host/xhci-ring.c, line 3268 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 2177 drivers/usb/mon/mon_text.c, line 168 drivers/usb/musb/ux500_dma.c, line 79 drivers/usb/storage/alauda.c, line 917 drivers/usb/storage/alauda.c, line 1010 drivers/usb/storage/datafab.c, line 146 drivers/usb/storage/datafab.c, line 230 drivers/usb/storage/ene_ub6250.c, line 640 drivers/usb/storage/ene_ub6250.c, line 1492 drivers/usb/storage/isd200.c, line 331 drivers/usb/storage/sddr55.c, line 203 drivers/usb/storage/sddr55.c, line 324 drivers/usb/storage/shuttle_usbat.c, line 1127 drivers/usb/storage/shuttle_usbat.c, line 1218 drivers/usb/storage/shuttle_usbat.c, line 1298 drivers/usb/storage/transport.c, line 412 drivers/usb/storage/transport.c, line 493 drivers/usb/storage/transport.c, line 1186 drivers/usb/usbip/stub_rx.c, line 459 drivers/usb/usbip/usbip_common.c, line 683 include/linux/usb.h, line 1571 include/linux/usb.h, line 1769 include/linux/usb.h, line 1771 include/linux/usb.h, line 1774 include/linux/usb.h, line 1777 include/linux/usb.h, line 1878