ALSA: usb-audio: rename substream format field to altset_idx

The snd_usb_substream::format field actually contains the index of the
current alternate setting, so rename it to altset_idx to avoid
confusion.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/card.h

@@ -54,7 +54,7 @@ struct snd_usb_substream {
 	struct audioformat *cur_audiofmt;	/* current audioformat pointer (for hw_params callback) */
 	unsigned int cur_rate;		/* current rate (for hw_params callback) */
 	unsigned int period_bytes;	/* current period bytes (for hw_params callback) */
-	unsigned int format;     /* USB data format */
+	unsigned int altset_idx;     /* USB data format: index of alternate setting */
 	unsigned int datapipe;   /* the data i/o pipe */
 	unsigned int syncpipe;   /* 1 - async out or adaptive in */
 	unsigned int datainterval;	/* log_2 of data packet interval */

sound/usb/pcm.c

@@ -202,11 +202,11 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 			return -EIO;
 		}
 		subs->interface = -1;
-		subs->format = 0;
+		subs->altset_idx = 0;
 	}
 
 	/* set interface */
-	if (subs->interface != fmt->iface || subs->format != fmt->altset_idx) {
+	if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 		if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 			snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 				   dev->devnum, fmt->iface, fmt->altsetting);
@@ -214,7 +214,7 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 		}
 		snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 		subs->interface = fmt->iface;
-		subs->format = fmt->altset_idx;
+		subs->altset_idx = fmt->altset_idx;
 	}
 
 	/* create a data pipe */
@@ -771,7 +771,7 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 	struct snd_usb_substream *subs = &as->substream[direction];
 
 	subs->interface = -1;
-	subs->format = 0;
+	subs->altset_idx = 0;
 	runtime->hw = snd_usb_hardware;
 	runtime->private_data = subs;
 	subs->pcm_substream = substream;

sound/usb/proc.c

@@ -116,7 +116,7 @@ static void proc_dump_substream_status(struct snd_usb_substream *subs, struct sn
 		unsigned int i;
 		snd_iprintf(buffer, "  Status: Running\n");
 		snd_iprintf(buffer, "    Interface = %d\n", subs->interface);
-		snd_iprintf(buffer, "    Altset = %d\n", subs->format);
+		snd_iprintf(buffer, "    Altset = %d\n", subs->altset_idx);
 		snd_iprintf(buffer, "    URBs = %d [ ", subs->nurbs);
 		for (i = 0; i < subs->nurbs; i++)
 			snd_iprintf(buffer, "%d ", subs->dataurb[i].packets);