[balbi-usb:next 21/42] drivers/usb/gadget/function/f_midi.c:836:24: error: 'f_midi_rmidi_free' undeclared

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git next
head:   af982758d0a9e5189e657de2bbab2f65f16c48cc
commit: b8bd28e32e5fc3ad2d8c80ad3978fabb523a1763 [21/42] usb: gadget: f_midi: Use snd_card_free_when_closed with refcount
config: i386-randconfig-x075-201733 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout b8bd28e32e5fc3ad2d8c80ad3978fabb523a1763
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/usb/gadget/function/f_midi.c: In function 'f_midi_register_card':
>> drivers/usb/gadget/function/f_midi.c:836:24: error: 'f_midi_rmidi_free' undeclared (first use in this function)
     rmidi->private_free = f_midi_rmidi_free;
                           ^~~~~~~~~~~~~~~~~
   drivers/usb/gadget/function/f_midi.c:836:24: note: each undeclared identifier is reported only once for each function it appears in
   At top level:
   drivers/usb/gadget/function/f_midi.c:1249:13: warning: 'f_midi_rmidi_free' defined but not used [-Wunused-function]
    static void f_midi_rmidi_free(struct snd_rawmidi *rmidi)
                ^~~~~~~~~~~~~~~~~

vim +/f_midi_rmidi_free +836 drivers/usb/gadget/function/f_midi.c

   792	
   793	/* register as a sound "card" */
   794	static int f_midi_register_card(struct f_midi *midi)
   795	{
   796		struct snd_card *card;
   797		struct snd_rawmidi *rmidi;
   798		int err;
   799		static struct snd_device_ops ops = {
   800			.dev_free = f_midi_snd_free,
   801		};
   802	
   803		err = snd_card_new(&midi->gadget->dev, midi->index, midi->id,
   804				   THIS_MODULE, 0, &card);
   805		if (err < 0) {
   806			ERROR(midi, "snd_card_new() failed\n");
   807			goto fail;
   808		}
   809		midi->card = card;
   810	
   811		err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops);
   812		if (err < 0) {
   813			ERROR(midi, "snd_device_new() failed: error %d\n", err);
   814			goto fail;
   815		}
   816	
   817		strcpy(card->driver, f_midi_longname);
   818		strcpy(card->longname, f_midi_longname);
   819		strcpy(card->shortname, f_midi_shortname);
   820	
   821		/* Set up rawmidi */
   822		snd_component_add(card, "MIDI");
   823		err = snd_rawmidi_new(card, card->longname, 0,
   824				      midi->out_ports, midi->in_ports, &rmidi);
   825		if (err < 0) {
   826			ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err);
   827			goto fail;
   828		}
   829		midi->rmidi = rmidi;
   830		midi->in_last_port = 0;
   831		strcpy(rmidi->name, card->shortname);
   832		rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
   833				    SNDRV_RAWMIDI_INFO_INPUT |
   834				    SNDRV_RAWMIDI_INFO_DUPLEX;
   835		rmidi->private_data = midi;
 > 836		rmidi->private_free = f_midi_rmidi_free;
   837		midi->free_ref++;
   838	
   839		/*
   840		 * Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT.
   841		 * It's an upside-down world being a gadget.
   842		 */
   843		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops);
   844		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops);
   845	
   846		/* register it - we're ready to go */
   847		err = snd_card_register(card);
   848		if (err < 0) {
   849			ERROR(midi, "snd_card_register() failed\n");
   850			goto fail;
   851		}
   852	
   853		VDBG(midi, "%s() finished ok\n", __func__);
   854		return 0;
   855	
   856	fail:
   857		f_midi_unregister_card(midi);
   858		return err;
   859	}
   860	

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