D43767.diff
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	diff --git a/sys/dev/sound/usb/uaudio.c b/sys/dev/sound/usb/uaudio.c
	--- a/sys/dev/sound/usb/uaudio.c
	+++ b/sys/dev/sound/usb/uaudio.c
	@@ -1725,6 +1725,7 @@
	uint8_t audio_if = 0;
	uint8_t midi_if = 0;
	uint8_t uma_if_class;
	+ uint8_t i;

	while ((desc = usb_desc_foreach(cd, desc))) {
	if ((desc->bDescriptorType == UDESC_INTERFACE) &&
	@@ -2017,6 +2018,20 @@
	chan->set_alt = 0;
	chan->cur_alt = CHAN_MAX_ALT;

	+ for (i = 0; i != chan->num_alt; i++) {
	+ chan_alt = &chan->usb_alt[i];
	+
	+ if (chan_alt->sample_rate == rate &&
	+ chan_alt->channels == channels &&
	+ chan_alt->p_fmt->bPrecision == bit_resolution) {
	+ DPRINTF("Skipping duplicate configuration: "
	+ "sample rate = %dHz, channels = %d, "
	+ "bits = %d\n",
	+ rate, channels, bit_resolution);
	+ goto next_ep;
	+ }
	+ }
	+
	chan_alt = &chan->usb_alt[chan->num_alt++];

	#ifdef USB_DEBUG