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ALSA: usb-audio: ignore broken processing/extension unit 

Some devices have broken extension unit where getting current value
doesn't work. Attempt that once when creating mixer control for it. If
it fails, just ignore it, so that it won't cripple the device entirely
(and/or make the error floods).

Signed-off-by: Tom Yan <tom.ty89@gmail.com>
Link: https://lore.kernel.org/r/5f3abc52.1c69fb81.9cf2.fe91@mx.google.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Tom Yan 2020-08-18 01:20:11 +08:00 committed by Takashi Iwai
parent 23dc958689
commit d8d0db7bb3
1 changed files with 7 additions and 1 deletions
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8
sound/usb/mixer.c
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@ -2371,7 +2371,7 @@ static int build_audio_procunit(struct mixer_build *state, int unitid,
int num_ins;
struct usb_mixer_elem_info *cval;
struct snd_kcontrol *kctl;
int i, err, nameid, type, len;
int i, err, nameid, type, len, val;
const struct procunit_info *info;
const struct procunit_value_info *valinfo;
const struct usbmix_name_map *map;
@ -2474,6 +2474,12 @@ static int build_audio_procunit(struct mixer_build *state, int unitid,
break;
}
err = get_cur_ctl_value(cval, cval->control << 8, &val);
if (err < 0) {
usb_mixer_elem_info_free(cval);
return -EINVAL;
}
kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
if (!kctl) {
usb_mixer_elem_info_free(cval);