Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / sound / usb / mixer_quirks.c

diff --git a/kernel/sound/usb/mixer_quirks.c b/kernel/sound/usb/mixer_quirks.c
index 2790256..04991b0 100644 (file)
--- a/kernel/sound/usb/mixer_quirks.c
+++ b/kernel/sound/usb/mixer_quirks.c
@@ -1519,7 +1519,11 @@ static int snd_microii_spdif_default_get(struct snd_kcontrol *kcontrol,
 
        /* use known values for that card: interface#1 altsetting#1 */
        iface = usb_ifnum_to_if(chip->dev, 1);
+       if (!iface || iface->num_altsetting < 2)
+               return -EINVAL;
        alts = &iface->altsetting[1];
+       if (get_iface_desc(alts)->bNumEndpoints < 1)
+               return -EINVAL;
        ep = get_endpoint(alts, 0)->bEndpointAddress;
 
        err = snd_usb_ctl_msg(chip->dev,
@@ -1827,6 +1831,7 @@ void snd_usb_mixer_rc_memory_change(struct usb_mixer_interface *mixer,
 }
 
 static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer,
+                                        struct usb_mixer_elem_info *cval,
                                         struct snd_kcontrol *kctl)
 {
        /* Approximation using 10 ranges based on output measurement on hw v1.2.
@@ -1844,10 +1849,19 @@ static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer,
                41, 50, TLV_DB_MINMAX_ITEM(-441, 0),
        );
 
-       usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk\n");
-       kctl->tlv.p = scale;
-       kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
-       kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+       if (cval->min == 0 && cval->max == 50) {
+               usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk (0-50 variant)\n");
+               kctl->tlv.p = scale;
+               kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
+               kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+
+       } else if (cval->min == 0 && cval->max <= 1000) {
+               /* Some other clearly broken DragonFly variant.
+                * At least a 0..53 variant (hw v1.0) exists.
+                */
+               usb_audio_info(mixer->chip, "ignoring too narrow dB range on a DragonFly device");
+               kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+       }
 }
 
 void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
@@ -1856,8 +1870,8 @@ void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
 {
        switch (mixer->chip->usb_id) {
        case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */
-               if (unitid == 7 && cval->min == 0 && cval->max == 50)
-                       snd_dragonfly_quirk_db_scale(mixer, kctl);
+               if (unitid == 7 && cval->control == UAC_FU_VOLUME)
+                       snd_dragonfly_quirk_db_scale(mixer, cval, kctl);
                break;
        }
 }