ALSA: usb-audio - Fix missing mixer dB information

[karo-tx-linux.git] / sound / usb / mixer.c

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index c04d7c71ac88836c32ee3fd3e533472de573c953..cdd19d7fe500b2a6315b3023212f1313032c5999 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -152,6 +152,7 @@ static inline void check_mapped_dB(const struct usbmix_name_map *p,
        if (p && p->dB) {
                cval->dBmin = p->dB->min;
                cval->dBmax = p->dB->max;
+               cval->initialized = 1;
        }
 }
 
@@ -1092,7 +1093,7 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
                                " Switch" : " Volume");
                if (control == UAC_FU_VOLUME) {
                        check_mapped_dB(map, cval);
-                       if (cval->dBmin < cval->dBmax) {
+                       if (cval->dBmin < cval->dBmax || !cval->initialized) {
                                kctl->tlv.c = mixer_vol_tlv;
                                kctl->vd[0].access |= 
                                        SNDRV_CTL_ELEM_ACCESS_TLV_READ |