Function prototype or declaration at include/linux/usb/gadget.h, line 241 References: drivers/usb/chipidea/udc.c, line 1735 drivers/usb/chipidea/udc.c, line 1740 drivers/usb/gadget/function/f_acm.c, line 436 drivers/usb/gadget/function/f_ecm.c, line 547 drivers/usb/gadget/function/f_fs.c, line 1891 drivers/usb/gadget/function/f_hid.c, line 655 drivers/usb/gadget/function/f_hid.c, line 680 drivers/usb/gadget/function/f_loopback.c, line 369 drivers/usb/gadget/function/f_mass_storage.c, line 2240 drivers/usb/gadget/function/f_mass_storage.c, line 2250 drivers/usb/gadget/function/f_midi.c, line 352 drivers/usb/gadget/function/f_ncm.c, line 881 drivers/usb/gadget/function/f_phonet.c, line 426 drivers/usb/gadget/function/f_phonet.c, line 427 drivers/usb/gadget/function/f_printer.c, line 772 drivers/usb/gadget/function/f_printer.c, line 778 drivers/usb/gadget/function/f_printer.c, line 879 drivers/usb/gadget/function/f_printer.c, line 881 drivers/usb/gadget/function/f_rndis.c, line 553 drivers/usb/gadget/function/f_sourcesink.c, line 656 drivers/usb/gadget/function/f_sourcesink.c, line 674 drivers/usb/gadget/function/f_sourcesink.c, line 696 drivers/usb/gadget/function/f_sourcesink.c, line 717 drivers/usb/gadget/function/f_tcm.c, line 441 drivers/usb/gadget/function/f_tcm.c, line 446 drivers/usb/gadget/function/f_tcm.c, line 894 drivers/usb/gadget/function/f_tcm.c, line 899 drivers/usb/gadget/function/f_tcm.c, line 904 drivers/usb/gadget/function/f_tcm.c, line 908 drivers/usb/gadget/function/f_uac1_legacy.c, line 608 drivers/usb/gadget/function/f_uvc.c, line 307 drivers/usb/gadget/function/f_uvc.c, line 358 drivers/usb/gadget/function/u_audio.c, line 382 drivers/usb/gadget/function/u_audio.c, line 458 drivers/usb/gadget/function/u_ether.c, line 678 drivers/usb/gadget/function/u_ether.c, line 679 drivers/usb/gadget/function/u_ether.c, line 1055 drivers/usb/gadget/function/u_ether.c, line 1063 drivers/usb/gadget/function/u_serial.c, line 1302 drivers/usb/gadget/function/u_serial.c, line 1307 drivers/usb/gadget/legacy/dbgp.c, line 171 drivers/usb/gadget/legacy/inode.c, line 792 drivers/usb/gadget/udc/core.c, line 94 drivers/usb/gadget/udc/core.c, line 112 drivers/usb/gadget/udc/trace.h, line 178 include/linux/usb/gadget.h, line 241 include/linux/usb/gadget.h, line 256