ALSA: usb-audio - Check the dB-range validity in the later read, too

commit 9fcd0ab130579d9742538340edda3225f2b49a3e upstream.

When the initial check of dB-range failed due to the read error, try to
check again at the later read, too.  When an invalid dB range is found,
remove TLV flags and notify the mixer info change.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 2 deletions

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index cdd19d7fe50..a033129e973 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -881,8 +881,17 @@ static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_
                 uinfo->value.integer.min = 0;
                 uinfo->value.integer.max = 1;
         } else {
-                if (! cval->initialized)
-                        get_min_max(cval,  0);
+                if (!cval->initialized) {
+                        get_min_max(cval, 0);
+                        if (cval->initialized && cval->dBmin >= cval->dBmax) {
+                                kcontrol->vd[0].access &=
+                                        ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
+                                          SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
+                                snd_ctl_notify(cval->mixer->chip->card,
+                                               SNDRV_CTL_EVENT_MASK_INFO,
+                                               &kcontrol->id);
+                        }
+                }
                 uinfo->value.integer.min = 0;
                 uinfo->value.integer.max =
                         (cval->max - cval->min + cval->res - 1) / cval->res;