diff options
Diffstat (limited to 'sound/usb/mixer.c')
| -rw-r--r-- | sound/usb/mixer.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 5e4775716607..eab06edcc9b7 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1097,11 +1097,13 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc, append_ctl_name(kctl, control == UAC_FU_MUTE ? " Switch" : " Volume"); if (control == UAC_FU_VOLUME) { - kctl->tlv.c = mixer_vol_tlv; - kctl->vd[0].access |= - SNDRV_CTL_ELEM_ACCESS_TLV_READ | - SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; check_mapped_dB(map, cval); + if (cval->dBmin < cval->dBmax) { + kctl->tlv.c = mixer_vol_tlv; + kctl->vd[0].access |= + SNDRV_CTL_ELEM_ACCESS_TLV_READ | + SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; + } } break; @@ -1182,7 +1184,7 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc, /* * parse a feature unit * - * most of controlls are defined here. + * most of controls are defined here. */ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr) { |