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>

1 files changed, 3 insertions, 3 deletions

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;
 			}
 		}