[ALSA] usb-audio - move mixer data into separate struct

USB generic driver
Move all data related to audio control interfaces into a separate struct
local to usbmixer.c.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

sound/usb/usbaudio.c

@@ -3091,6 +3091,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
 	chip->card = card;
 	INIT_LIST_HEAD(&chip->pcm_list);
 	INIT_LIST_HEAD(&chip->midi_list);
+	INIT_LIST_HEAD(&chip->mixer_list);
 
 	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 		snd_usb_audio_free(chip);
@@ -3290,6 +3291,10 @@ static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
 		list_for_each(p, &chip->midi_list) {
 			snd_usbmidi_disconnect(p);
 		}
+		/* release mixer resources */
+		list_for_each(p, &chip->mixer_list) {
+			snd_usb_mixer_disconnect(p);
+		}
 		usb_chip[chip->index] = NULL;
 		up(&register_mutex);
 		snd_card_free(card);

sound/usb/usbaudio.h

@@ -136,7 +136,7 @@ struct snd_usb_audio {
 	struct list_head midi_list;	/* list of midi interfaces */
 	int next_midi_device;
 
-	unsigned int ignore_ctl_error;	/* for mixer */
+	struct list_head mixer_list;	/* list of mixer interfaces */
 };
 
 /*
@@ -219,6 +219,7 @@ void *snd_usb_find_csint_desc(void *descstart, int desclen, void *after, u8 dsub
 int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request, __u8 requesttype, __u16 value, __u16 index, void *data, __u16 size, int timeout);
 
 int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif);
+void snd_usb_mixer_disconnect(struct list_head *p);
 
 int snd_usb_create_midi_interface(snd_usb_audio_t *chip, struct usb_interface *iface, const snd_usb_audio_quirk_t *quirk);
 void snd_usbmidi_input_stop(struct list_head* p);