106 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)  in snd_rawmidi_ready()  argument
111 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_ready()
112 	ready = __snd_rawmidi_ready(substream->runtime);  in snd_rawmidi_ready()
113 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_ready()
117 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,  in snd_rawmidi_ready_append()  argument
120 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in snd_rawmidi_ready_append()
123 	       (!substream->append || runtime->avail >= count);  in snd_rawmidi_ready_append()
132 		runtime->event(runtime->substream);  in snd_rawmidi_input_event_work()
146 static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)  in snd_rawmidi_buffer_ref_sync()  argument
150 	spin_lock_irq(&substream->lock);  in snd_rawmidi_buffer_ref_sync()
151 	while (substream->runtime->buffer_ref) {  in snd_rawmidi_buffer_ref_sync()
152 		spin_unlock_irq(&substream->lock);  in snd_rawmidi_buffer_ref_sync()
154 			rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");  in snd_rawmidi_buffer_ref_sync()
158 		spin_lock_irq(&substream->lock);  in snd_rawmidi_buffer_ref_sync()
160 	spin_unlock_irq(&substream->lock);  in snd_rawmidi_buffer_ref_sync()
163 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)  in snd_rawmidi_runtime_create()  argument
170 	runtime->substream = substream;  in snd_rawmidi_runtime_create()
176 	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)  in snd_rawmidi_runtime_create()
186 	substream->runtime = runtime;  in snd_rawmidi_runtime_create()
187 	if (rawmidi_is_ump(substream->rmidi))  in snd_rawmidi_runtime_create()
204 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)  in snd_rawmidi_runtime_free()  argument
206 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in snd_rawmidi_runtime_free()
210 	substream->runtime = NULL;  in snd_rawmidi_runtime_free()
214 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)  in snd_rawmidi_output_trigger()  argument
216 	if (!substream->opened)  in snd_rawmidi_output_trigger()
218 	substream->ops->trigger(substream, up);  in snd_rawmidi_output_trigger()
221 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)  in snd_rawmidi_input_trigger()  argument
223 	if (!substream->opened)  in snd_rawmidi_input_trigger()
225 	substream->ops->trigger(substream, up);  in snd_rawmidi_input_trigger()
227 		cancel_work_sync(&substream->runtime->event_work);  in snd_rawmidi_input_trigger()
238 static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,  in reset_runtime_ptrs()  argument
243 	spin_lock_irqsave(&substream->lock, flags);  in reset_runtime_ptrs()
244 	if (substream->opened && substream->runtime)  in reset_runtime_ptrs()
245 		__reset_runtime_ptrs(substream->runtime, is_input);  in reset_runtime_ptrs()
246 	spin_unlock_irqrestore(&substream->lock, flags);  in reset_runtime_ptrs()
249 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)  in snd_rawmidi_drop_output()  argument
251 	snd_rawmidi_output_trigger(substream, 0);  in snd_rawmidi_drop_output()
252 	reset_runtime_ptrs(substream, false);  in snd_rawmidi_drop_output()
257 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)  in snd_rawmidi_drain_output()  argument
263 	spin_lock_irq(&substream->lock);  in snd_rawmidi_drain_output()
264 	runtime = substream->runtime;  in snd_rawmidi_drain_output()
265 	if (!substream->opened || !runtime || !runtime->buffer) {  in snd_rawmidi_drain_output()
271 	spin_unlock_irq(&substream->lock);  in snd_rawmidi_drain_output()
279 	spin_lock_irq(&substream->lock);  in snd_rawmidi_drain_output()
283 		rmidi_warn(substream->rmidi,  in snd_rawmidi_drain_output()
289 	spin_unlock_irq(&substream->lock);  in snd_rawmidi_drain_output()
293 		if (substream->ops->drain)  in snd_rawmidi_drain_output()
294 			substream->ops->drain(substream);  in snd_rawmidi_drain_output()
297 		snd_rawmidi_drop_output(substream);  in snd_rawmidi_drain_output()
300 	spin_lock_irq(&substream->lock);  in snd_rawmidi_drain_output()
302 	spin_unlock_irq(&substream->lock);  in snd_rawmidi_drain_output()
308 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)  in snd_rawmidi_drain_input()  argument
310 	snd_rawmidi_input_trigger(substream, 0);  in snd_rawmidi_drain_input()
311 	reset_runtime_ptrs(substream, true);  in snd_rawmidi_drain_input()
323 	struct snd_rawmidi_substream *substream;  in assign_substream()  local
335 	list_for_each_entry(substream, &s->substreams, list) {  in assign_substream()
336 		if (substream->opened) {  in assign_substream()
339 			    !substream->append)  in assign_substream()
342 		if (subdevice < 0 || subdevice == substream->number) {  in assign_substream()
343 			*sub_ret = substream;  in assign_substream()
352 			  struct snd_rawmidi_substream *substream,  in open_substream()  argument
357 	if (substream->use_count == 0) {  in open_substream()
358 		err = snd_rawmidi_runtime_create(substream);  in open_substream()
361 		err = substream->ops->open(substream);  in open_substream()
363 			snd_rawmidi_runtime_free(substream);  in open_substream()
366 		spin_lock_irq(&substream->lock);  in open_substream()
367 		substream->opened = 1;  in open_substream()
368 		substream->active_sensing = 0;  in open_substream()
370 			substream->append = 1;  in open_substream()
371 		substream->pid = get_pid(task_pid(current));  in open_substream()
372 		rmidi->streams[substream->stream].substream_opened++;  in open_substream()
373 		spin_unlock_irq(&substream->lock);  in open_substream()
375 	substream->use_count++;  in open_substream()
380 			    struct snd_rawmidi_substream *substream,
549 			    struct snd_rawmidi_substream *substream,  in close_substream()  argument
552 	if (--substream->use_count)  in close_substream()
556 		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)  in close_substream()
557 			snd_rawmidi_input_trigger(substream, 0);  in close_substream()
559 			if (substream->active_sensing) {  in close_substream()
564 				snd_rawmidi_kernel_write(substream, &buf, 1);  in close_substream()
566 			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)  in close_substream()
567 				snd_rawmidi_output_trigger(substream, 0);  in close_substream()
569 		snd_rawmidi_buffer_ref_sync(substream);  in close_substream()
571 	spin_lock_irq(&substream->lock);  in close_substream()
572 	substream->opened = 0;  in close_substream()
573 	substream->append = 0;  in close_substream()
574 	spin_unlock_irq(&substream->lock);  in close_substream()
575 	substream->ops->close(substream);  in close_substream()
576 	if (substream->runtime->private_free)  in close_substream()
577 		substream->runtime->private_free(substream);  in close_substream()
578 	snd_rawmidi_runtime_free(substream);  in close_substream()
579 	put_pid(substream->pid);  in close_substream()
580 	substream->pid = NULL;  in close_substream()
581 	rmidi->streams[substream->stream].substream_opened--;  in close_substream()
634 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,  in snd_rawmidi_info()  argument
639 	if (substream == NULL)  in snd_rawmidi_info()
641 	rmidi = substream->rmidi;  in snd_rawmidi_info()
645 	info->subdevice = substream->number;  in snd_rawmidi_info()
646 	info->stream = substream->stream;  in snd_rawmidi_info()
650 	strcpy(info->subname, substream->name);  in snd_rawmidi_info()
651 	info->subdevices_count = substream->pstr->substream_count;  in snd_rawmidi_info()
652 	info->subdevices_avail = (substream->pstr->substream_count -  in snd_rawmidi_info()
653 				  substream->pstr->substream_opened);  in snd_rawmidi_info()
657 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,  in snd_rawmidi_info_user()  argument
663 	err = snd_rawmidi_info(substream, &info);  in snd_rawmidi_info_user()
676 	struct snd_rawmidi_substream *substream;  in __snd_rawmidi_info_select()  local
689 	list_for_each_entry(substream, &pstr->substreams, list) {  in __snd_rawmidi_info_select()
690 		if ((unsigned int)substream->number == info->subdevice)  in __snd_rawmidi_info_select()
691 			return snd_rawmidi_info(substream, info);  in __snd_rawmidi_info_select()
727 static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,  in resize_runtime_buffer()  argument
731 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in resize_runtime_buffer()
747 		spin_lock_irq(&substream->lock);  in resize_runtime_buffer()
749 			spin_unlock_irq(&substream->lock);  in resize_runtime_buffer()
757 		spin_unlock_irq(&substream->lock);  in resize_runtime_buffer()
764 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,  in snd_rawmidi_output_params()  argument
769 	snd_rawmidi_drain_output(substream);  in snd_rawmidi_output_params()
770 	mutex_lock(&substream->rmidi->open_mutex);  in snd_rawmidi_output_params()
771 	if (substream->append && substream->use_count > 1)  in snd_rawmidi_output_params()
774 		err = resize_runtime_buffer(substream, params, false);  in snd_rawmidi_output_params()
777 		substream->active_sensing = !params->no_active_sensing;  in snd_rawmidi_output_params()
778 	mutex_unlock(&substream->rmidi->open_mutex);  in snd_rawmidi_output_params()
783 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,  in snd_rawmidi_input_params()  argument
790 	snd_rawmidi_drain_input(substream);  in snd_rawmidi_input_params()
791 	mutex_lock(&substream->rmidi->open_mutex);  in snd_rawmidi_input_params()
799 		err = resize_runtime_buffer(substream, params, true);  in snd_rawmidi_input_params()
802 		substream->framing = framing;  in snd_rawmidi_input_params()
803 		substream->clock_type = clock_type;  in snd_rawmidi_input_params()
805 	mutex_unlock(&substream->rmidi->open_mutex);  in snd_rawmidi_input_params()
810 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,  in snd_rawmidi_output_status()  argument
813 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in snd_rawmidi_output_status()
817 	spin_lock_irq(&substream->lock);  in snd_rawmidi_output_status()
819 	spin_unlock_irq(&substream->lock);  in snd_rawmidi_output_status()
823 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,  in snd_rawmidi_input_status()  argument
826 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in snd_rawmidi_input_status()
830 	spin_lock_irq(&substream->lock);  in snd_rawmidi_input_status()
834 	spin_unlock_irq(&substream->lock);  in snd_rawmidi_input_status()
1101 static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,  in receive_with_tstamp_framing()  argument
1104 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in receive_with_tstamp_framing()
1140 static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)  in get_framing_tstamp()  argument
1144 	switch (substream->clock_type) {  in get_framing_tstamp()
1168 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,  in snd_rawmidi_receive()  argument
1172 	struct timespec64 ts64 = get_framing_tstamp(substream);  in snd_rawmidi_receive()
1176 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_receive()
1177 	if (!substream->opened) {  in snd_rawmidi_receive()
1181 	runtime = substream->runtime;  in snd_rawmidi_receive()
1183 		rmidi_dbg(substream->rmidi,  in snd_rawmidi_receive()
1193 	if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {  in snd_rawmidi_receive()
1194 		result = receive_with_tstamp_framing(substream, buffer, count, &ts64);  in snd_rawmidi_receive()
1196 		substream->bytes++;  in snd_rawmidi_receive()
1206 		substream->bytes += count;  in snd_rawmidi_receive()
1243 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_receive()
1248 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,  in snd_rawmidi_kernel_read1()  argument
1254 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in snd_rawmidi_kernel_read1()
1258 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_kernel_read1()
1276 			spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_kernel_read1()
1280 			spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_kernel_read1()
1289 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_kernel_read1()
1293 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,  in snd_rawmidi_kernel_read()  argument
1296 	snd_rawmidi_input_trigger(substream, 1);  in snd_rawmidi_kernel_read()
1297 	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);  in snd_rawmidi_kernel_read()
1307 	struct snd_rawmidi_substream *substream;  in snd_rawmidi_read()  local
1311 	substream = rfile->input;  in snd_rawmidi_read()
1312 	if (substream == NULL)  in snd_rawmidi_read()
1314 	runtime = substream->runtime;  in snd_rawmidi_read()
1315 	snd_rawmidi_input_trigger(substream, 1);  in snd_rawmidi_read()
1318 		spin_lock_irq(&substream->lock);  in snd_rawmidi_read()
1323 				spin_unlock_irq(&substream->lock);  in snd_rawmidi_read()
1329 			spin_unlock_irq(&substream->lock);  in snd_rawmidi_read()
1336 			spin_lock_irq(&substream->lock);  in snd_rawmidi_read()
1338 				spin_unlock_irq(&substream->lock);  in snd_rawmidi_read()
1342 		spin_unlock_irq(&substream->lock);  in snd_rawmidi_read()
1343 		count1 = snd_rawmidi_kernel_read1(substream,  in snd_rawmidi_read()
1362 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)  in snd_rawmidi_transmit_empty()  argument
1368 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_transmit_empty()
1369 	runtime = substream->runtime;  in snd_rawmidi_transmit_empty()
1370 	if (!substream->opened || !runtime || !runtime->buffer) {  in snd_rawmidi_transmit_empty()
1371 		rmidi_dbg(substream->rmidi,  in snd_rawmidi_transmit_empty()
1377 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_transmit_empty()
1390 static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,  in __snd_rawmidi_transmit_peek()  argument
1394 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in __snd_rawmidi_transmit_peek()
1397 		rmidi_dbg(substream->rmidi,  in __snd_rawmidi_transmit_peek()
1449 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,  in snd_rawmidi_transmit_peek()  argument
1455 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_transmit_peek()
1456 	if (!substream->opened || !substream->runtime)  in snd_rawmidi_transmit_peek()
1459 		result = __snd_rawmidi_transmit_peek(substream, buffer, count);  in snd_rawmidi_transmit_peek()
1460 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_transmit_peek()
1472 static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,  in __snd_rawmidi_transmit_ack()  argument
1475 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in __snd_rawmidi_transmit_ack()
1478 		rmidi_dbg(substream->rmidi,  in __snd_rawmidi_transmit_ack()
1487 	substream->bytes += count;  in __snd_rawmidi_transmit_ack()
1506 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)  in snd_rawmidi_transmit_ack()  argument
1511 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_transmit_ack()
1512 	if (!substream->opened || !substream->runtime)  in snd_rawmidi_transmit_ack()
1515 		result = __snd_rawmidi_transmit_ack(substream, count);  in snd_rawmidi_transmit_ack()
1516 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_transmit_ack()
1531 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,  in snd_rawmidi_transmit()  argument
1537 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_transmit()
1538 	if (!substream->opened)  in snd_rawmidi_transmit()
1541 		count = __snd_rawmidi_transmit_peek(substream, buffer, count);  in snd_rawmidi_transmit()
1545 			result = __snd_rawmidi_transmit_ack(substream, count);  in snd_rawmidi_transmit()
1547 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_transmit()
1558 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)  in snd_rawmidi_proceed()  argument
1564 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_proceed()
1565 	runtime = substream->runtime;  in snd_rawmidi_proceed()
1566 	if (substream->opened && runtime &&  in snd_rawmidi_proceed()
1569 		__snd_rawmidi_transmit_ack(substream, count);  in snd_rawmidi_proceed()
1571 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_proceed()
1576 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,  in snd_rawmidi_kernel_write1()  argument
1583 	struct snd_rawmidi_runtime *runtime = substream->runtime;  in snd_rawmidi_kernel_write1()
1592 	spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_kernel_write1()
1593 	if (substream->append) {  in snd_rawmidi_kernel_write1()
1595 			spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_kernel_write1()
1617 			spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_kernel_write1()
1620 				spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_kernel_write1()
1624 			spin_lock_irqsave(&substream->lock, flags);  in snd_rawmidi_kernel_write1()
1632 	spin_unlock_irqrestore(&substream->lock, flags);  in snd_rawmidi_kernel_write1()
1634 		snd_rawmidi_output_trigger(substream, 1);  in snd_rawmidi_kernel_write1()
1638 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,  in snd_rawmidi_kernel_write()  argument
1641 	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);  in snd_rawmidi_kernel_write()
1652 	struct snd_rawmidi_substream *substream;  in snd_rawmidi_write()  local
1655 	substream = rfile->output;  in snd_rawmidi_write()
1656 	runtime = substream->runtime;  in snd_rawmidi_write()
1658 	if (substream->append && count > runtime->buffer_size)  in snd_rawmidi_write()
1662 		spin_lock_irq(&substream->lock);  in snd_rawmidi_write()
1663 		while (!snd_rawmidi_ready_append(substream, count)) {  in snd_rawmidi_write()
1667 				spin_unlock_irq(&substream->lock);  in snd_rawmidi_write()
1673 			spin_unlock_irq(&substream->lock);  in snd_rawmidi_write()
1680 			spin_lock_irq(&substream->lock);  in snd_rawmidi_write()
1682 				spin_unlock_irq(&substream->lock);  in snd_rawmidi_write()
1686 		spin_unlock_irq(&substream->lock);  in snd_rawmidi_write()
1687 		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);  in snd_rawmidi_write()
1697 		spin_lock_irq(&substream->lock);  in snd_rawmidi_write()
1705 			spin_unlock_irq(&substream->lock);  in snd_rawmidi_write()
1712 			spin_lock_irq(&substream->lock);  in snd_rawmidi_write()
1714 		spin_unlock_irq(&substream->lock);  in snd_rawmidi_write()
1762 	struct snd_rawmidi_substream *substream;  in snd_rawmidi_proc_info_read()  local
1777 		list_for_each_entry(substream,  in snd_rawmidi_proc_info_read()
1783 				    substream->number,  in snd_rawmidi_proc_info_read()
1784 				    (unsigned long) substream->bytes);  in snd_rawmidi_proc_info_read()
1785 			if (substream->opened) {  in snd_rawmidi_proc_info_read()
1788 				    pid_vnr(substream->pid));  in snd_rawmidi_proc_info_read()
1789 				runtime = substream->runtime;  in snd_rawmidi_proc_info_read()
1790 				spin_lock_irq(&substream->lock);  in snd_rawmidi_proc_info_read()
1793 				spin_unlock_irq(&substream->lock);  in snd_rawmidi_proc_info_read()
1804 		list_for_each_entry(substream,  in snd_rawmidi_proc_info_read()
1810 				    substream->number,  in snd_rawmidi_proc_info_read()
1811 				    (unsigned long) substream->bytes);  in snd_rawmidi_proc_info_read()
1812 			if (substream->opened) {  in snd_rawmidi_proc_info_read()
1815 					    pid_vnr(substream->pid));  in snd_rawmidi_proc_info_read()
1816 				runtime = substream->runtime;  in snd_rawmidi_proc_info_read()
1817 				spin_lock_irq(&substream->lock);  in snd_rawmidi_proc_info_read()
1821 				spin_unlock_irq(&substream->lock);  in snd_rawmidi_proc_info_read()
1827 				if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {  in snd_rawmidi_proc_info_read()
1828 					clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;  in snd_rawmidi_proc_info_read()
1862 	struct snd_rawmidi_substream *substream;  in snd_rawmidi_alloc_substreams()  local
1866 		substream = kzalloc(sizeof(*substream), GFP_KERNEL);  in snd_rawmidi_alloc_substreams()
1867 		if (!substream)  in snd_rawmidi_alloc_substreams()
1869 		substream->stream = direction;  in snd_rawmidi_alloc_substreams()
1870 		substream->number = idx;  in snd_rawmidi_alloc_substreams()
1871 		substream->rmidi = rmidi;  in snd_rawmidi_alloc_substreams()
1872 		substream->pstr = stream;  in snd_rawmidi_alloc_substreams()
1873 		spin_lock_init(&substream->lock);  in snd_rawmidi_alloc_substreams()
1874 		list_add_tail(&substream->list, &stream->substreams);  in snd_rawmidi_alloc_substreams()
1971 	struct snd_rawmidi_substream *substream;  in snd_rawmidi_free_substreams()  local
1974 		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);  in snd_rawmidi_free_substreams()
1975 		list_del(&substream->list);  in snd_rawmidi_free_substreams()
1976 		kfree(substream);  in snd_rawmidi_free_substreams()
2159 	struct snd_rawmidi_substream *substream;  in snd_rawmidi_set_ops()  local
2161 	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)  in snd_rawmidi_set_ops()
2162 		substream->ops = ops;  in snd_rawmidi_set_ops()