Structure at include/linux/usb.h, line 1456 References: drivers/usb/core/message.c, line 254 drivers/usb/core/message.c, line 270 drivers/usb/core/message.c, line 361 drivers/usb/core/message.c, line 549 drivers/usb/core/message.c, line 623 drivers/usb/misc/usbtest.c, line 400 drivers/usb/misc/usbtest.c, line 1564 drivers/usb/storage/usb.h, line 139 include/linux/usb.h, line 1213 include/linux/usb.h, line 1456 include/linux/usb.h, line 1479 include/linux/usb.h, line 1488 include/linux/usb.h, line 1489