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

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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: Daniel Mack <zonque@gmail.com>
Reported-by: Nicolai Krakowiak <nicolai.krakowiak@gmail.com>
Reported-by: Lean-Yves LENHOF <jean-yves@lenhof.eu.org>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack 2011-08-04 15:56:28 +02:00 committed by Takashi Iwai
parent 60c961a9e1
commit 1faa5d07a9
2 changed files with 9 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
sound/usb/mixer.c
View File

@ -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;

1
sound/usb/mixer.h
View File

@ -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;