ALSA: usb-audio: Fix the first PCM interface assignment

In the new PCM streaming logic, the interface number is assigned to
usb stream instance (subs->interface) after the format and rate setups
are succeeded, but some codes are still passing subs->interface as the
reference to helper functions.  This leads to initializing with an
invalid iface number (-1).

This patch replaces the wrong references with the ones from the target
fmt correctly.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 54607f8c4f66..f0ede134a111 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -387,7 +387,7 @@ add_sync_ep:
                 subs->data_endpoint->sync_master = subs->sync_endpoint;
         }
 
-        if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
+        if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
                 return err;
 
         subs->cur_audiofmt = fmt;
@@ -450,7 +450,7 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
                 struct usb_interface *iface;
                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
                 alts = &iface->altsetting[fmt->altset_idx];
-                ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
+                ret = snd_usb_init_sample_rate(subs->stream->chip, fmt->iface, alts, fmt, rate);
                 if (ret < 0)
                         return ret;
                 subs->cur_rate = rate;