1 files changed, 4 insertions, 0 deletions

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 5b01330b8452..1bc45e71f1fe 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -129,6 +129,7 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 {
         struct audioformat *fp;
         struct usb_host_interface *alts;
+        struct usb_interface_descriptor *altsd;
         int stream, err;
         unsigned *rate_table = NULL;
 
@@ -166,6 +167,9 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
                 return -EINVAL;
         }
         alts = &iface->altsetting[fp->altset_idx];
+        altsd = get_iface_desc(alts);
+        fp->protocol = altsd->bInterfaceProtocol;
+
         if (fp->datainterval == 0)
                 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
         if (fp->maxpacksize == 0)