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Commit 1faa5d07 authored by Daniel Mack's avatar Daniel Mack Committed by Takashi Iwai
Browse files

ALSA: snd-usb: operate on given mixer interface only 



When creating the mixers for an USB audio device, the current code looks
at the host interface stored in mixer->chip->ctrl_if. Change this and
rather keep a local pointer to the interface that was given when
snd_usb_create_mixer() was called.

Signed-off-by: default avatarDaniel Mack <zonque@gmail.com>
Reported-by: default avatarNicolai Krakowiak <nicolai.krakowiak@gmail.com>
Reported-by: default avatarLean-Yves LENHOF <jean-yves@lenhof.eu.org>
Acked-by: default avatarClemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 60c961a9

sound/usb/mixer.c

+8 −12
Original line number Diff line number Diff line
@@ -1939,15 +1939,13 @@ static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer) 
	struct mixer_build state;

	int err;

	const struct usbmix_ctl_map *map;

	struct usb_host_interface *hostif;

	void *p;



	hostif = mixer->chip->ctrl_intf;

	memset(&state, 0, sizeof(state));

	state.chip = mixer->chip;

	state.mixer = mixer;

	state.buffer = hostif->extra;

	state.buflen = hostif->extralen;

	state.buffer = mixer->hostif->extra;

	state.buflen = mixer->hostif->extralen;



	/* check the mapping table */

	for (map = usbmix_ctl_maps; map->id; map++) {
@@ -1960,7 +1958,8 @@ static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer) 
	}



	p = NULL;

	while ((p = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, p, UAC_OUTPUT_TERMINAL)) != NULL) {

	while ((p = snd_usb_find_csint_desc(mixer->hostif->extra, mixer->hostif->extralen,

					    p, UAC_OUTPUT_TERMINAL)) != NULL) {

		if (mixer->protocol == UAC_VERSION_1) {

			struct uac1_output_terminal_descriptor *desc = p;
@@ -2167,17 +2166,15 @@ int snd_usb_mixer_activate(struct usb_mixer_interface *mixer) 
/* create the handler for the optional status interrupt endpoint */

static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)

{

	struct usb_host_interface *hostif;

	struct usb_endpoint_descriptor *ep;

	void *transfer_buffer;

	int buffer_length;

	unsigned int epnum;



	hostif = mixer->chip->ctrl_intf;

	/* we need one interrupt input endpoint */

	if (get_iface_desc(hostif)->bNumEndpoints < 1)

	if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)

		return 0;

	ep = get_endpoint(hostif, 0);

	ep = get_endpoint(mixer->hostif, 0);

	if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))

		return 0;
@@ -2207,7 +2204,6 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif, 
	};

	struct usb_mixer_interface *mixer;

	struct snd_info_entry *entry;

	struct usb_host_interface *host_iface;

	int err;



	strcpy(chip->card->mixername, "USB Mixer");
@@ -2224,8 +2220,8 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif, 
		return -ENOMEM;

	}



	host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];

	switch (get_iface_desc(host_iface)->bInterfaceProtocol) {

	mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];

	switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {

	case UAC_VERSION_1:

	default:

		mixer->protocol = UAC_VERSION_1;

sound/usb/mixer.h

+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 


struct usb_mixer_interface {

	struct snd_usb_audio *chip;

	struct usb_host_interface *hostif;

	struct list_head list;

	unsigned int ignore_ctl_error;

	struct urb *urb;