Function prototype or declaration at include/linux/usb/gadget.h, line 252 References: drivers/usb/chipidea/udc.c, line 852 drivers/usb/chipidea/udc.c, line 916 drivers/usb/chipidea/udc.c, line 1032 drivers/usb/gadget/function/f_mass_storage.c, line 2301 drivers/usb/gadget/function/f_mass_storage.c, line 2305 drivers/usb/gadget/function/f_uvc.c, line 765 drivers/usb/gadget/function/f_uvc.c, line 925 drivers/usb/gadget/function/uvc_video.c, line 293 drivers/usb/gadget/legacy/inode.c, line 515 drivers/usb/gadget/legacy/inode.c, line 558 drivers/usb/gadget/legacy/inode.c, line 1564 drivers/usb/gadget/legacy/inode.c, line 1622 drivers/usb/gadget/legacy/inode.c, line 1654 drivers/usb/gadget/udc/core.c, line 202 drivers/usb/gadget/udc/core.c, line 208 drivers/usb/gadget/udc/trace.h, line 259 include/linux/usb/gadget.h, line 252 include/linux/usb/gadget.h, line 271