ALSA: usb-audio - Fix missing mixer dB information

The recent fix for testing dB range at the mixer creation time seems
to cause regressions in some devices.  In such devices, reading the dB
info at probing time gives an error, thus both dBmin and dBmax are still
zero, and TLV flag isn't set although the later read of dB info succeeds.

This patch adds a workaround for such a case by assuming that the later
read will succeed.  In future, a similar test should be performed in a
case where a wrong dB range is seen even in the later read.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: <stable@kernel.org>

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 |