ALSA: usb-audio: rename alt_idx to altsetting

As Clemens Ladisch kindly explained:
 "Please note that there are two methods to identify alternate settings:
  the number, which is the value in bAlternateSetting, and the index,
  which is the index in the descriptor array.  There might be some wording
  in the USB spec that these two values must be the same, but in reality,
  [insert standard rant about firmware writers], bAlternateSetting
  must be treated as a random ID value."

This patch changes the name to express the correct usage semantics.
No functional change.

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 7 insertions, 7 deletions

diff --git a/sound/usb/card.h b/sound/usb/card.h
index ca98a9b915c9..9867ab866857 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -96,7 +96,7 @@ struct snd_usb_endpoint {
         unsigned int syncinterval;      /* P for adaptive mode, 0 otherwise */
         unsigned char silence_value;
         unsigned int stride;
-        int iface, alt_idx;
+        int iface, altsetting;
         int skip_packets;               /* quirks for devices to ignore the first n packets
                                            in a stream */
 
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 26856601422b..e25e32a8824d 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -426,9 +426,9 @@ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
         list_for_each_entry(ep, &chip->ep_list, list) {
                 if (ep->ep_num == ep_num &&
                     ep->iface == alts->desc.bInterfaceNumber &&
-                    ep->alt_idx == alts->desc.bAlternateSetting) {
+                    ep->altsetting == alts->desc.bAlternateSetting) {
                         snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n",
-                                        ep_num, ep->iface, ep->alt_idx, ep);
+                                        ep_num, ep->iface, ep->altsetting, ep);
                         goto __exit_unlock;
                 }
         }
@@ -447,7 +447,7 @@ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
         ep->type = type;
         ep->ep_num = ep_num;
         ep->iface = alts->desc.bInterfaceNumber;
-        ep->alt_idx = alts->desc.bAlternateSetting;
+        ep->altsetting = alts->desc.bAlternateSetting;
         INIT_LIST_HEAD(&ep->ready_playback_urbs);
         ep_num &= USB_ENDPOINT_NUMBER_MASK;
 
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 0c1a95dd5538..ca3256d6fde3 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -241,17 +241,17 @@ static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 
                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
-                    subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
+                    subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
                         err = usb_set_interface(subs->dev,
                                                 subs->sync_endpoint->iface,
-                                                subs->sync_endpoint->alt_idx);
+                                                subs->sync_endpoint->altsetting);
                         if (err < 0) {
                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
                                 snd_printk(KERN_ERR
                                            "%d:%d:%d: cannot set interface (%d)\n",
                                            subs->dev->devnum,
                                            subs->sync_endpoint->iface,
-                                           subs->sync_endpoint->alt_idx, err);
+                                           subs->sync_endpoint->altsetting, err);
                                 return -EIO;
                         }
                 }