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>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index cdd19d7fe500b2a6315b3023212f1313032c5999..a033129e97338db1b8b5a90872a3861932fdf514 100644 (file)
--- 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;