90 		usb_free_coherent(u->ep->chip->dev, u->buffer_size,  in release_urb_ctx()
130 int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep)  in snd_usb_endpoint_implicit_feedback_sink()  argument
132 	return  ep->sync_master &&  in snd_usb_endpoint_implicit_feedback_sink()
133 		ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA &&  in snd_usb_endpoint_implicit_feedback_sink()
134 		ep->type == SND_USB_ENDPOINT_TYPE_DATA &&  in snd_usb_endpoint_implicit_feedback_sink()
135 		usb_pipeout(ep->pipe);  in snd_usb_endpoint_implicit_feedback_sink()
145 int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)  in snd_usb_endpoint_next_packet_size()  argument
150 	if (ep->fill_max)  in snd_usb_endpoint_next_packet_size()
151 		return ep->maxframesize;  in snd_usb_endpoint_next_packet_size()
153 	spin_lock_irqsave(&ep->lock, flags);  in snd_usb_endpoint_next_packet_size()
154 	ep->phase = (ep->phase & 0xffff)  in snd_usb_endpoint_next_packet_size()
155 		+ (ep->freqm << ep->datainterval);  in snd_usb_endpoint_next_packet_size()
156 	ret = min(ep->phase >> 16, ep->maxframesize);  in snd_usb_endpoint_next_packet_size()
157 	spin_unlock_irqrestore(&ep->lock, flags);  in snd_usb_endpoint_next_packet_size()
162 static void retire_outbound_urb(struct snd_usb_endpoint *ep,  in retire_outbound_urb()  argument
165 	if (ep->retire_data_urb)  in retire_outbound_urb()
166 		ep->retire_data_urb(ep->data_subs, urb_ctx->urb);  in retire_outbound_urb()
169 static void retire_inbound_urb(struct snd_usb_endpoint *ep,  in retire_inbound_urb()  argument
174 	if (unlikely(ep->skip_packets > 0)) {  in retire_inbound_urb()
175 		ep->skip_packets--;  in retire_inbound_urb()
179 	if (ep->sync_slave)  in retire_inbound_urb()
180 		snd_usb_handle_sync_urb(ep->sync_slave, ep, urb);  in retire_inbound_urb()
182 	if (ep->retire_data_urb)  in retire_inbound_urb()
183 		ep->retire_data_urb(ep->data_subs, urb);  in retire_inbound_urb()
186 static void prepare_silent_urb(struct snd_usb_endpoint *ep,  in prepare_silent_urb()  argument
196 	if (ep->chip->tx_length_quirk)  in prepare_silent_urb()
207 			counts = snd_usb_endpoint_next_packet_size(ep);  in prepare_silent_urb()
209 		length = counts * ep->stride; /* number of silent bytes */  in prepare_silent_urb()
210 		offset = offs * ep->stride + extra * i;  in prepare_silent_urb()
219 		       ep->silence_value, length);  in prepare_silent_urb()
224 	urb->transfer_buffer_length = offs * ep->stride + ctx->packets * extra;  in prepare_silent_urb()
230 static void prepare_outbound_urb(struct snd_usb_endpoint *ep,  in prepare_outbound_urb()  argument
236 	urb->dev = ep->chip->dev; /* we need to set this at each time */  in prepare_outbound_urb()
238 	switch (ep->type) {  in prepare_outbound_urb()
240 		if (ep->prepare_data_urb) {  in prepare_outbound_urb()
241 			ep->prepare_data_urb(ep->data_subs, urb);  in prepare_outbound_urb()
244 			prepare_silent_urb(ep, ctx);  in prepare_outbound_urb()
249 		if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) {  in prepare_outbound_urb()
256 			cp[0] = ep->freqn;  in prepare_outbound_urb()
257 			cp[1] = ep->freqn >> 8;  in prepare_outbound_urb()
258 			cp[2] = ep->freqn >> 16;  in prepare_outbound_urb()
259 			cp[3] = ep->freqn >> 24;  in prepare_outbound_urb()
267 			cp[0] = ep->freqn >> 2;  in prepare_outbound_urb()
268 			cp[1] = ep->freqn >> 10;  in prepare_outbound_urb()
269 			cp[2] = ep->freqn >> 18;  in prepare_outbound_urb()
279 static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep,  in prepare_inbound_urb()  argument
285 	urb->dev = ep->chip->dev; /* we need to set this at each time */  in prepare_inbound_urb()
287 	switch (ep->type) {  in prepare_inbound_urb()
292 			urb->iso_frame_desc[i].length = ep->curpacksize;  in prepare_inbound_urb()
293 			offs += ep->curpacksize;  in prepare_inbound_urb()
301 		urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize);  in prepare_inbound_urb()
321 static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)  in queue_pending_output_urbs()  argument
323 	while (test_bit(EP_FLAG_RUNNING, &ep->flags)) {  in queue_pending_output_urbs()
331 		spin_lock_irqsave(&ep->lock, flags);  in queue_pending_output_urbs()
332 		if (ep->next_packet_read_pos != ep->next_packet_write_pos) {  in queue_pending_output_urbs()
333 			packet = ep->next_packet + ep->next_packet_read_pos;  in queue_pending_output_urbs()
334 			ep->next_packet_read_pos++;  in queue_pending_output_urbs()
335 			ep->next_packet_read_pos %= MAX_URBS;  in queue_pending_output_urbs()
338 			if (!list_empty(&ep->ready_playback_urbs))  in queue_pending_output_urbs()
339 				ctx = list_first_entry(&ep->ready_playback_urbs,  in queue_pending_output_urbs()
342 		spin_unlock_irqrestore(&ep->lock, flags);  in queue_pending_output_urbs()
355 		prepare_outbound_urb(ep, ctx);  in queue_pending_output_urbs()
359 			usb_audio_err(ep->chip,  in queue_pending_output_urbs()
363 			set_bit(ctx->index, &ep->active_mask);  in queue_pending_output_urbs()
373 	struct snd_usb_endpoint *ep = ctx->ep;  in snd_complete_urb()  local
384 	if (unlikely(atomic_read(&ep->chip->shutdown)))  in snd_complete_urb()
387 	if (usb_pipeout(ep->pipe)) {  in snd_complete_urb()
388 		retire_outbound_urb(ep, ctx);  in snd_complete_urb()
390 		if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))  in snd_complete_urb()
393 		if (snd_usb_endpoint_implicit_feedback_sink(ep)) {  in snd_complete_urb()
394 			spin_lock_irqsave(&ep->lock, flags);  in snd_complete_urb()
395 			list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);  in snd_complete_urb()
396 			spin_unlock_irqrestore(&ep->lock, flags);  in snd_complete_urb()
397 			queue_pending_output_urbs(ep);  in snd_complete_urb()
402 		prepare_outbound_urb(ep, ctx);  in snd_complete_urb()
404 		retire_inbound_urb(ep, ctx);  in snd_complete_urb()
406 		if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))  in snd_complete_urb()
409 		prepare_inbound_urb(ep, ctx);  in snd_complete_urb()
416 	usb_audio_err(ep->chip, "cannot submit urb (err = %d)\n", err);  in snd_complete_urb()
417 	if (ep->data_subs && ep->data_subs->pcm_substream) {  in snd_complete_urb()
418 		substream = ep->data_subs->pcm_substream;  in snd_complete_urb()
423 	clear_bit(ctx->index, &ep->active_mask);  in snd_complete_urb()
449 	struct snd_usb_endpoint *ep;  in snd_usb_add_endpoint()  local
457 	list_for_each_entry(ep, &chip->ep_list, list) {  in snd_usb_add_endpoint()
458 		if (ep->ep_num == ep_num &&  in snd_usb_add_endpoint()
459 		    ep->iface == alts->desc.bInterfaceNumber &&  in snd_usb_add_endpoint()
460 		    ep->altsetting == alts->desc.bAlternateSetting) {  in snd_usb_add_endpoint()
461 			usb_audio_dbg(ep->chip,  in snd_usb_add_endpoint()
463 					ep_num, ep->iface, ep->altsetting, ep);  in snd_usb_add_endpoint()
473 	ep = kzalloc(sizeof(*ep), GFP_KERNEL);  in snd_usb_add_endpoint()
474 	if (!ep)  in snd_usb_add_endpoint()
477 	ep->chip = chip;  in snd_usb_add_endpoint()
478 	spin_lock_init(&ep->lock);  in snd_usb_add_endpoint()
479 	ep->type = type;  in snd_usb_add_endpoint()
480 	ep->ep_num = ep_num;  in snd_usb_add_endpoint()
481 	ep->iface = alts->desc.bInterfaceNumber;  in snd_usb_add_endpoint()
482 	ep->altsetting = alts->desc.bAlternateSetting;  in snd_usb_add_endpoint()
483 	INIT_LIST_HEAD(&ep->ready_playback_urbs);  in snd_usb_add_endpoint()
487 		ep->pipe = usb_sndisocpipe(chip->dev, ep_num);  in snd_usb_add_endpoint()
489 		ep->pipe = usb_rcvisocpipe(chip->dev, ep_num);  in snd_usb_add_endpoint()
495 			ep->syncinterval = get_endpoint(alts, 1)->bRefresh;  in snd_usb_add_endpoint()
497 			ep->syncinterval = 1;  in snd_usb_add_endpoint()
500 			ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1;  in snd_usb_add_endpoint()
502 			ep->syncinterval = 3;  in snd_usb_add_endpoint()
504 		ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);  in snd_usb_add_endpoint()
507 		    ep->syncmaxsize == 4)  in snd_usb_add_endpoint()
508 			ep->udh01_fb_quirk = 1;  in snd_usb_add_endpoint()
511 	list_add_tail(&ep->list, &chip->ep_list);  in snd_usb_add_endpoint()
516 	return ep;  in snd_usb_add_endpoint()
522 static int wait_clear_urbs(struct snd_usb_endpoint *ep)  in wait_clear_urbs()  argument
528 		alive = bitmap_weight(&ep->active_mask, ep->nurbs);  in wait_clear_urbs()
536 		usb_audio_err(ep->chip,  in wait_clear_urbs()
538 			alive, ep->ep_num);  in wait_clear_urbs()
539 	clear_bit(EP_FLAG_STOPPING, &ep->flags);  in wait_clear_urbs()
547 void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep)  in snd_usb_endpoint_sync_pending_stop()  argument
549 	if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags))  in snd_usb_endpoint_sync_pending_stop()
550 		wait_clear_urbs(ep);  in snd_usb_endpoint_sync_pending_stop()
556 static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force)  in deactivate_urbs()  argument
560 	if (!force && atomic_read(&ep->chip->shutdown)) /* to be sure... */  in deactivate_urbs()
563 	clear_bit(EP_FLAG_RUNNING, &ep->flags);  in deactivate_urbs()
565 	INIT_LIST_HEAD(&ep->ready_playback_urbs);  in deactivate_urbs()
566 	ep->next_packet_read_pos = 0;  in deactivate_urbs()
567 	ep->next_packet_write_pos = 0;  in deactivate_urbs()
569 	for (i = 0; i < ep->nurbs; i++) {  in deactivate_urbs()
570 		if (test_bit(i, &ep->active_mask)) {  in deactivate_urbs()
571 			if (!test_and_set_bit(i, &ep->unlink_mask)) {  in deactivate_urbs()
572 				struct urb *u = ep->urb[i].urb;  in deactivate_urbs()
584 static void release_urbs(struct snd_usb_endpoint *ep, int force)  in release_urbs()  argument
589 	ep->retire_data_urb = NULL;  in release_urbs()
590 	ep->prepare_data_urb = NULL;  in release_urbs()
593 	deactivate_urbs(ep, force);  in release_urbs()
594 	wait_clear_urbs(ep);  in release_urbs()
596 	for (i = 0; i < ep->nurbs; i++)  in release_urbs()
597 		release_urb_ctx(&ep->urb[i]);  in release_urbs()
599 	if (ep->syncbuf)  in release_urbs()
600 		usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,  in release_urbs()
601 				  ep->syncbuf, ep->sync_dma);  in release_urbs()
603 	ep->syncbuf = NULL;  in release_urbs()
604 	ep->nurbs = 0;  in release_urbs()
610 static int data_ep_set_params(struct snd_usb_endpoint *ep,  in data_ep_set_params()  argument
623 	int tx_length_quirk = (ep->chip->tx_length_quirk &&  in data_ep_set_params()
624 			       usb_pipeout(ep->pipe));  in data_ep_set_params()
635 	ep->datainterval = fmt->datainterval;  in data_ep_set_params()
636 	ep->stride = frame_bits >> 3;  in data_ep_set_params()
637 	ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;  in data_ep_set_params()
640 	ep->freqmax = ep->freqn + (ep->freqn >> 2);  in data_ep_set_params()
656 	maxsize = (((ep->freqmax << ep->datainterval) + 0xffff) >> 16) *  in data_ep_set_params()
661 	if (ep->maxpacksize && ep->maxpacksize < maxsize) {  in data_ep_set_params()
663 		unsigned int data_maxsize = maxsize = ep->maxpacksize;  in data_ep_set_params()
668 		ep->freqmax = (data_maxsize / (frame_bits >> 3))  in data_ep_set_params()
669 				<< (16 - ep->datainterval);  in data_ep_set_params()
672 	if (ep->fill_max)  in data_ep_set_params()
673 		ep->curpacksize = ep->maxpacksize;  in data_ep_set_params()
675 		ep->curpacksize = maxsize;  in data_ep_set_params()
677 	if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {  in data_ep_set_params()
678 		packs_per_ms = 8 >> ep->datainterval;  in data_ep_set_params()
684 	if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))  in data_ep_set_params()
687 	max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);  in data_ep_set_params()
697 	if (usb_pipein(ep->pipe) ||  in data_ep_set_params()
698 			snd_usb_endpoint_implicit_feedback_sink(ep)) {  in data_ep_set_params()
707 		if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {  in data_ep_set_params()
708 			int interval = ep->datainterval;  in data_ep_set_params()
718 		ep->nurbs = MAX_URBS;  in data_ep_set_params()
728 		minsize = (ep->freqn >> (16 - ep->datainterval)) *  in data_ep_set_params()
745 		ep->max_urb_frames = DIV_ROUND_UP(frames_per_period,  in data_ep_set_params()
751 		ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer);  in data_ep_set_params()
755 	for (i = 0; i < ep->nurbs; i++) {  in data_ep_set_params()
756 		struct snd_urb_ctx *u = &ep->urb[i];  in data_ep_set_params()
758 		u->ep = ep;  in data_ep_set_params()
769 			usb_alloc_coherent(ep->chip->dev, u->buffer_size,  in data_ep_set_params()
773 		u->urb->pipe = ep->pipe;  in data_ep_set_params()
775 		u->urb->interval = 1 << ep->datainterval;  in data_ep_set_params()
784 	release_urbs(ep, 0);  in data_ep_set_params()
791 static int sync_ep_set_params(struct snd_usb_endpoint *ep)  in sync_ep_set_params()  argument
795 	ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4,  in sync_ep_set_params()
796 					 GFP_KERNEL, &ep->sync_dma);  in sync_ep_set_params()
797 	if (!ep->syncbuf)  in sync_ep_set_params()
801 		struct snd_urb_ctx *u = &ep->urb[i];  in sync_ep_set_params()
803 		u->ep = ep;  in sync_ep_set_params()
808 		u->urb->transfer_buffer = ep->syncbuf + i * 4;  in sync_ep_set_params()
809 		u->urb->transfer_dma = ep->sync_dma + i * 4;  in sync_ep_set_params()
811 		u->urb->pipe = ep->pipe;  in sync_ep_set_params()
814 		u->urb->interval = 1 << ep->syncinterval;  in sync_ep_set_params()
819 	ep->nurbs = SYNC_URBS;  in sync_ep_set_params()
824 	release_urbs(ep, 0);  in sync_ep_set_params()
845 int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,  in snd_usb_endpoint_set_params()  argument
857 	if (ep->use_count != 0) {  in snd_usb_endpoint_set_params()
858 		usb_audio_warn(ep->chip,  in snd_usb_endpoint_set_params()
860 			 ep->ep_num);  in snd_usb_endpoint_set_params()
865 	release_urbs(ep, 0);  in snd_usb_endpoint_set_params()
867 	ep->datainterval = fmt->datainterval;  in snd_usb_endpoint_set_params()
868 	ep->maxpacksize = fmt->maxpacksize;  in snd_usb_endpoint_set_params()
869 	ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX);  in snd_usb_endpoint_set_params()
871 	if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL)  in snd_usb_endpoint_set_params()
872 		ep->freqn = get_usb_full_speed_rate(rate);  in snd_usb_endpoint_set_params()
874 		ep->freqn = get_usb_high_speed_rate(rate);  in snd_usb_endpoint_set_params()
877 	ep->freqm = ep->freqn;  in snd_usb_endpoint_set_params()
878 	ep->freqshift = INT_MIN;  in snd_usb_endpoint_set_params()
880 	ep->phase = 0;  in snd_usb_endpoint_set_params()
882 	switch (ep->type) {  in snd_usb_endpoint_set_params()
884 		err = data_ep_set_params(ep, pcm_format, channels,  in snd_usb_endpoint_set_params()
889 		err = sync_ep_set_params(ep);  in snd_usb_endpoint_set_params()
895 	usb_audio_dbg(ep->chip,  in snd_usb_endpoint_set_params()
897 		ep->ep_num, ep->type, ep->nurbs, err);  in snd_usb_endpoint_set_params()
917 int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep)  in snd_usb_endpoint_start()  argument
922 	if (atomic_read(&ep->chip->shutdown))  in snd_usb_endpoint_start()
926 	if (++ep->use_count != 1)  in snd_usb_endpoint_start()
930 	deactivate_urbs(ep, false);  in snd_usb_endpoint_start()
932 		wait_clear_urbs(ep);  in snd_usb_endpoint_start()
934 	ep->active_mask = 0;  in snd_usb_endpoint_start()
935 	ep->unlink_mask = 0;  in snd_usb_endpoint_start()
936 	ep->phase = 0;  in snd_usb_endpoint_start()
938 	snd_usb_endpoint_start_quirk(ep);  in snd_usb_endpoint_start()
947 	set_bit(EP_FLAG_RUNNING, &ep->flags);  in snd_usb_endpoint_start()
949 	if (snd_usb_endpoint_implicit_feedback_sink(ep)) {  in snd_usb_endpoint_start()
950 		for (i = 0; i < ep->nurbs; i++) {  in snd_usb_endpoint_start()
951 			struct snd_urb_ctx *ctx = ep->urb + i;  in snd_usb_endpoint_start()
952 			list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);  in snd_usb_endpoint_start()
958 	for (i = 0; i < ep->nurbs; i++) {  in snd_usb_endpoint_start()
959 		struct urb *urb = ep->urb[i].urb;  in snd_usb_endpoint_start()
964 		if (usb_pipeout(ep->pipe)) {  in snd_usb_endpoint_start()
965 			prepare_outbound_urb(ep, urb->context);  in snd_usb_endpoint_start()
967 			prepare_inbound_urb(ep, urb->context);  in snd_usb_endpoint_start()
972 			usb_audio_err(ep->chip,  in snd_usb_endpoint_start()
977 		set_bit(i, &ep->active_mask);  in snd_usb_endpoint_start()
983 	clear_bit(EP_FLAG_RUNNING, &ep->flags);  in snd_usb_endpoint_start()
984 	ep->use_count--;  in snd_usb_endpoint_start()
985 	deactivate_urbs(ep, false);  in snd_usb_endpoint_start()
1003 void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep)  in snd_usb_endpoint_stop()  argument
1005 	if (!ep)  in snd_usb_endpoint_stop()
1008 	if (snd_BUG_ON(ep->use_count == 0))  in snd_usb_endpoint_stop()
1011 	if (--ep->use_count == 0) {  in snd_usb_endpoint_stop()
1012 		deactivate_urbs(ep, false);  in snd_usb_endpoint_stop()
1013 		ep->data_subs = NULL;  in snd_usb_endpoint_stop()
1014 		ep->sync_slave = NULL;  in snd_usb_endpoint_stop()
1015 		ep->retire_data_urb = NULL;  in snd_usb_endpoint_stop()
1016 		ep->prepare_data_urb = NULL;  in snd_usb_endpoint_stop()
1017 		set_bit(EP_FLAG_STOPPING, &ep->flags);  in snd_usb_endpoint_stop()
1031 void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)  in snd_usb_endpoint_deactivate()  argument
1033 	if (!ep)  in snd_usb_endpoint_deactivate()
1036 	if (ep->use_count != 0)  in snd_usb_endpoint_deactivate()
1039 	deactivate_urbs(ep, true);  in snd_usb_endpoint_deactivate()
1040 	wait_clear_urbs(ep);  in snd_usb_endpoint_deactivate()
1051 void snd_usb_endpoint_release(struct snd_usb_endpoint *ep)  in snd_usb_endpoint_release()  argument
1053 	release_urbs(ep, 1);  in snd_usb_endpoint_release()
1063 void snd_usb_endpoint_free(struct snd_usb_endpoint *ep)  in snd_usb_endpoint_free()  argument
1065 	kfree(ep);  in snd_usb_endpoint_free()
1078 void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,  in snd_usb_handle_sync_urb()  argument
1086 	snd_BUG_ON(ep == sender);  in snd_usb_handle_sync_urb()
1094 	if (snd_usb_endpoint_implicit_feedback_sink(ep) &&  in snd_usb_handle_sync_urb()
1095 	    ep->use_count != 0) {  in snd_usb_handle_sync_urb()
1116 		spin_lock_irqsave(&ep->lock, flags);  in snd_usb_handle_sync_urb()
1117 		out_packet = ep->next_packet + ep->next_packet_write_pos;  in snd_usb_handle_sync_urb()
1138 		ep->next_packet_write_pos++;  in snd_usb_handle_sync_urb()
1139 		ep->next_packet_write_pos %= MAX_URBS;  in snd_usb_handle_sync_urb()
1140 		spin_unlock_irqrestore(&ep->lock, flags);  in snd_usb_handle_sync_urb()
1141 		queue_pending_output_urbs(ep);  in snd_usb_handle_sync_urb()
1179 		if (f < ep->freqn - 0x8000)  in snd_usb_handle_sync_urb()
1181 		else if (f > ep->freqn + 0x8000)  in snd_usb_handle_sync_urb()
1183 	} else if (unlikely(ep->freqshift == INT_MIN)) {  in snd_usb_handle_sync_urb()
1191 		while (f < ep->freqn - ep->freqn / 4) {  in snd_usb_handle_sync_urb()
1195 		while (f > ep->freqn + ep->freqn / 2) {  in snd_usb_handle_sync_urb()
1199 		ep->freqshift = shift;  in snd_usb_handle_sync_urb()
1200 	} else if (ep->freqshift >= 0)  in snd_usb_handle_sync_urb()
1201 		f <<= ep->freqshift;  in snd_usb_handle_sync_urb()
1203 		f >>= -ep->freqshift;  in snd_usb_handle_sync_urb()
1205 	if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) {  in snd_usb_handle_sync_urb()
1210 		spin_lock_irqsave(&ep->lock, flags);  in snd_usb_handle_sync_urb()
1211 		ep->freqm = f;  in snd_usb_handle_sync_urb()
1212 		spin_unlock_irqrestore(&ep->lock, flags);  in snd_usb_handle_sync_urb()
1218 		ep->freqshift = INT_MIN;  in snd_usb_handle_sync_urb()