1 files changed, 12 insertions, 1 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index ca7949598191..42bb95c739a8 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -2258,7 +2258,8 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
         };
         struct usb_mixer_interface *mixer;
         struct snd_info_entry *entry;
-        int err;
+        struct usb_host_interface *host_iface;
+        int err, protocol;
 
         strcpy(chip->card->mixername, "USB Mixer");
 
@@ -2275,6 +2276,16 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
                 return -ENOMEM;
         }
 
+        host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
+        protocol = host_iface->desc.bInterfaceProtocol;
+
+        /* FIXME! */
+        if (protocol != UAC_VERSION_1) {
+                snd_printk(KERN_WARNING "mixer interface protocol 0x%02x not yet supported\n",
+                                        protocol);
+                return 0;
+        }
+
         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
             (err = snd_usb_mixer_status_create(mixer)) < 0)
                 goto _error;