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authorDaniel Mack <zonque@gmail.com>2011-08-04 15:56:28 +0200
committerTakashi Iwai <tiwai@suse.de>2011-08-04 16:24:10 +0200
commit1faa5d07a93fc5b0a4a5254fc940a79e20b55540 (patch)
tree4b80fc6a93f5a626d5c45e4163a26f97c0a20171 /sound/usb
parent60c961a9e1ed879a4d151df6076bf1203f595f73 (diff)
downloadlinux-linaro-precise-1faa5d07a93fc5b0a4a5254fc940a79e20b55540.tar.gz
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: 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>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/mixer.c20
-rw-r--r--sound/usb/mixer.h1
2 files changed, 9 insertions, 12 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index ee9aa087d8b..c04d7c71ac8 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -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;
diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index ae1a14dcfe8..81b2d8a32fb 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -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;