Merge tag 'sound-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

Pull sound updates from Takashi Iwai:
 "The most significant changes at this cycle are the Sound Open Firmware
  support from Intel for the common DSP framework along with its support
  for Intel platforms. It's a door opened to a real "free" firmware (in
  the sense of FOSS), and other parties show interests in it.

  In addition to SOF, we've got a bunch of updates and fixes as usual.
  Some highlights are below.

  ALSA core:
   - Cleanups and fixes in ALSA timer code to cover some races spotted
     by syzkaller
   - Cleanups and fixes in ALSA sequencer code to cover some races,
     again unsurprisingly, spotted by syzkaller
   - Optimize the common page allocation helper with alloc_pages_exact()

  ASoC:
   - Add SOF core support, as well as Intel SOF platform support
   - Generic card driver improvements: support for MCLK/sample rate
     ratio and pin switches
   - A big set of improvements to TLV320AIC32x4 drivers
   - New drivers for Freescale audio mixers, several Intel machines,
     several Mediatek machines, Meson G12A, Spreadtrum compressed audio
     and DMA devices

  HD-audio:
   - A few Realtek codec fixes for reducing pop noises
   - Quirks for Chromebooks
   - Workaround for faulty connection report on AMD/Nvidia HDMI

  Others:
   - A quirk for Focusrite Scarlett Solo USB-audio
   - Add support for MOTU 8pre FireWire
   - 24bit sample format support in aloop
   - GUS patch format support (finally, over a decade) in native emux
     synth code"

* tag 'sound-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (375 commits)
  ASoC: SOF: Fix unused variable warnings
  ALSA: line6: toneport: Fix broken usage of timer for delayed execution
  ALSA: aica: Fix a long-time build breakage
  ALSA: hda/realtek - Support low power consumption for ALC256
  ASoC: stm32: i2s: update pcm hardware constraints
  ASoC: codec: hdac_hdmi: no checking monitor in hw_params
  ASoC: mediatek: mt6358: save PGA for mixer control
  ASoC: mediatek: mt6358: save output volume for mixer controls
  ASoC: mediatek: mt6358: initialize setting when ramping volume
  ASoC: SOF: core: fix undefined nocodec reference
  ASoC: SOF: xtensa: fix undefined references
  ASoC: SOF: Propagate sof_get_ctrl_copy_params() error properly
  ALSA: hdea/realtek - Headset fixup for System76 Gazelle (gaze14)
  ALSA: hda/intel: add CometLake PCI IDs
  ALSA: hda/realtek - Support low power consumption for ALC295
  ASoC: rockchip: Fix an uninitialized variable compile warning
  ASoC: SOF: Fix a compile warning with CONFIG_PCI=n
  ASoC: da7219: Fix a compile warning at CONFIG_COMMON_CLK=n
  ASoC: sound/soc/sof/: fix kconfig dependency warning
  ASoC: stm32: spdifrx: change trace level on iec control
  ...

sound/core/seq/oss/seq_oss_device.h

@@ -30,6 +30,7 @@
 #include <sound/rawmidi.h>
 #include <sound/seq_kernel.h>
 #include <sound/info.h>
+#include "../seq_clientmgr.h"
 
 /* max. applications */
 #define SNDRV_SEQ_OSS_MAX_CLIENTS	16
@@ -150,11 +151,16 @@ snd_seq_oss_dispatch(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int a
 	return snd_seq_kernel_client_dispatch(dp->cseq, ev, atomic, hop);
 }
 
-/* ioctl */
+/* ioctl for writeq */
 static inline int
 snd_seq_oss_control(struct seq_oss_devinfo *dp, unsigned int type, void *arg)
 {
-	return snd_seq_kernel_client_ctl(dp->cseq, type, arg);
+	int err;
+
+	snd_seq_client_ioctl_lock(dp->cseq);
+	err = snd_seq_kernel_client_ctl(dp->cseq, type, arg);
+	snd_seq_client_ioctl_unlock(dp->cseq);
+	return err;
 }
 
 /* fill the addresses in header */

sound/core/seq/oss/seq_oss_rw.c

@@ -180,14 +180,11 @@ insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt)
 		return 0; /* invalid event - no need to insert queue */
 
 	event.time.tick = snd_seq_oss_timer_cur_tick(dp->timer);
-	if (dp->timer->realtime || !dp->timer->running) {
+	if (dp->timer->realtime || !dp->timer->running)
 		snd_seq_oss_dispatch(dp, &event, 0, 0);
-	} else {
-		if (is_nonblock_mode(dp->file_mode))
-			rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, 0, 0);
-		else
-			rc = snd_seq_kernel_client_enqueue_blocking(dp->cseq, &event, opt, 0, 0);
-	}
+	else
+		rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, opt,
+						   !is_nonblock_mode(dp->file_mode));
 	return rc;
 }
 		

sound/core/seq/oss/seq_oss_writeq.c

@@ -116,7 +116,7 @@ snd_seq_oss_writeq_sync(struct seq_oss_writeq *q)
 		rec->t.code = SEQ_SYNCTIMER;
 		rec->t.time = time;
 		q->sync_event_put = 1;
-		snd_seq_kernel_client_enqueue_blocking(dp->cseq, &ev, NULL, 0, 0);
+		snd_seq_kernel_client_enqueue(dp->cseq, &ev, NULL, true);
 	}
 
 	wait_event_interruptible_timeout(q->sync_sleep, ! q->sync_event_put, HZ);

sound/core/seq/seq_clientmgr.c

@@ -179,6 +179,41 @@ struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
 	return client;
 }
 
+/* Take refcount and perform ioctl_mutex lock on the given client;
+ * used only for OSS sequencer
+ * Unlock via snd_seq_client_ioctl_unlock() below
+ */
+bool snd_seq_client_ioctl_lock(int clientid)
+{
+	struct snd_seq_client *client;
+
+	client = snd_seq_client_use_ptr(clientid);
+	if (!client)
+		return false;
+	mutex_lock(&client->ioctl_mutex);
+	/* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */
+	return true;
+}
+EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock);
+
+/* Unlock and unref the given client; for OSS sequencer use only */
+void snd_seq_client_ioctl_unlock(int clientid)
+{
+	struct snd_seq_client *client;
+
+	client = snd_seq_client_use_ptr(clientid);
+	if (WARN_ON(!client))
+		return;
+	mutex_unlock(&client->ioctl_mutex);
+	/* The doubly unrefs below are intentional; the first one releases the
+	 * leftover from snd_seq_client_ioctl_lock() above, and the second one
+	 * is for releasing snd_seq_client_use_ptr() in this function
+	 */
+	snd_seq_client_unlock(client);
+	snd_seq_client_unlock(client);
+}
+EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock);
+
 static void usage_alloc(struct snd_seq_usage *res, int num)
 {
 	res->cur += num;
@@ -203,7 +238,6 @@ int __init client_init_data(void)
 
 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
 {
-	unsigned long flags;
 	int c;
 	struct snd_seq_client *client;
 
@@ -224,7 +258,7 @@ static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
 	mutex_init(&client->ioctl_mutex);
 
 	/* find free slot in the client table */
-	spin_lock_irqsave(&clients_lock, flags);
+	spin_lock_irq(&clients_lock);
 	if (client_index < 0) {
 		for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
 		     c < SNDRV_SEQ_MAX_CLIENTS;
@@ -232,17 +266,17 @@ static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
 			if (clienttab[c] || clienttablock[c])
 				continue;
 			clienttab[client->number = c] = client;
-			spin_unlock_irqrestore(&clients_lock, flags);
+			spin_unlock_irq(&clients_lock);
 			return client;
 		}
 	} else {
 		if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
 			clienttab[client->number = client_index] = client;
-			spin_unlock_irqrestore(&clients_lock, flags);
+			spin_unlock_irq(&clients_lock);
 			return client;
 		}
 	}
-	spin_unlock_irqrestore(&clients_lock, flags);
+	spin_unlock_irq(&clients_lock);
 	snd_seq_pool_delete(&client->pool);
 	kfree(client);
 	return NULL;	/* no free slot found or busy, return failure code */
@@ -251,23 +285,21 @@ static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
 
 static int seq_free_client1(struct snd_seq_client *client)
 {
-	unsigned long flags;
-
 	if (!client)
 		return 0;
-	spin_lock_irqsave(&clients_lock, flags);
+	spin_lock_irq(&clients_lock);
 	clienttablock[client->number] = 1;
 	clienttab[client->number] = NULL;
-	spin_unlock_irqrestore(&clients_lock, flags);
+	spin_unlock_irq(&clients_lock);
 	snd_seq_delete_all_ports(client);
 	snd_seq_queue_client_leave(client->number);
 	snd_use_lock_sync(&client->use_lock);
 	snd_seq_queue_client_termination(client->number);
 	if (client->pool)
 		snd_seq_pool_delete(&client->pool);
-	spin_lock_irqsave(&clients_lock, flags);
+	spin_lock_irq(&clients_lock);
 	clienttablock[client->number] = 0;
-	spin_unlock_irqrestore(&clients_lock, flags);
+	spin_unlock_irq(&clients_lock);
 	return 0;
 }
 
@@ -1900,20 +1932,14 @@ static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
 	int result;
 	struct snd_seq_client *sender = NULL;
 	struct snd_seq_client_port *sport = NULL;
-	struct snd_seq_subscribers *p;
 
 	result = -EINVAL;
 	if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
 		goto __end;
 	if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
 		goto __end;
-	p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
-	if (p) {
-		result = 0;
-		*subs = p->info;
-	} else
-		result = -ENOENT;
-
+	result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest,
+					       subs);
       __end:
       	if (sport)
 		snd_seq_port_unlock(sport);
@@ -2227,12 +2253,13 @@ int snd_seq_delete_kernel_client(int client)
 }
 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
 
-/* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
- * and snd_seq_kernel_client_enqueue_blocking
+/*
+ * exported, called by kernel clients to enqueue events (w/o blocking)
+ *
+ * RETURN VALUE: zero if succeed, negative if error
  */
-static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
-				 struct file *file, int blocking,
-				 int atomic, int hop)
+int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
+				  struct file *file, bool blocking)
 {
 	struct snd_seq_client *cptr;
 	int result;
@@ -2255,41 +2282,21 @@ static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
 	if (cptr == NULL)
 		return -EINVAL;
 	
-	if (! cptr->accept_output)
+	if (!cptr->accept_output) {
 		result = -EPERM;
-	else /* send it */
+	} else { /* send it */
+		mutex_lock(&cptr->ioctl_mutex);
 		result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
-						      atomic, hop, NULL);
+						      false, 0,
+						      &cptr->ioctl_mutex);
+		mutex_unlock(&cptr->ioctl_mutex);
+	}
 
 	snd_seq_client_unlock(cptr);
 	return result;
 }
-
-/*
- * exported, called by kernel clients to enqueue events (w/o blocking)
- *
- * RETURN VALUE: zero if succeed, negative if error
- */
-int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
-				  int atomic, int hop)
-{
-	return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
-}
 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
 
-/*
- * exported, called by kernel clients to enqueue events (with blocking)
- *
- * RETURN VALUE: zero if succeed, negative if error
- */
-int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
-					   struct file *file,
-					   int atomic, int hop)
-{
-	return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
-}
-EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
-
 /* 
  * exported, called by kernel clients to dispatch events directly to other
  * clients, bypassing the queues.  Event time-stamp will be updated.

sound/core/seq/seq_clientmgr.h

@@ -93,14 +93,14 @@ struct snd_seq_client *snd_seq_client_use_ptr(int clientid);
 /* dispatch event to client(s) */
 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop);
 
-/* exported to other modules */
-int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, int atomic, int hop);
-int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
-					   struct file *file, int atomic, int hop);
 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait);
 int snd_seq_client_notify_subscription(int client, int port,
 				       struct snd_seq_port_subscribe *info, int evtype);
 
+/* only for OSS sequencer */
+bool snd_seq_client_ioctl_lock(int clientid);
+void snd_seq_client_ioctl_unlock(int clientid);
+
 extern int seq_client_load[15];
 
 #endif

sound/core/seq/seq_fifo.c

@@ -98,18 +98,17 @@ static struct snd_seq_event_cell *fifo_cell_out(struct snd_seq_fifo *f);
 void snd_seq_fifo_clear(struct snd_seq_fifo *f)
 {
 	struct snd_seq_event_cell *cell;
-	unsigned long flags;
 
 	/* clear overflow flag */
 	atomic_set(&f->overflow, 0);
 
 	snd_use_lock_sync(&f->use_lock);
-	spin_lock_irqsave(&f->lock, flags);
+	spin_lock_irq(&f->lock);
 	/* drain the fifo */
 	while ((cell = fifo_cell_out(f)) != NULL) {
 		snd_seq_cell_free(cell);
 	}
-	spin_unlock_irqrestore(&f->lock, flags);
+	spin_unlock_irq(&f->lock);
 }
 
 
@@ -195,9 +194,9 @@ int snd_seq_fifo_cell_out(struct snd_seq_fifo *f,
 		}
 		set_current_state(TASK_INTERRUPTIBLE);
 		add_wait_queue(&f->input_sleep, &wait);
-		spin_unlock_irq(&f->lock);
+		spin_unlock_irqrestore(&f->lock, flags);
 		schedule();
-		spin_lock_irq(&f->lock);
+		spin_lock_irqsave(&f->lock, flags);
 		remove_wait_queue(&f->input_sleep, &wait);
 		if (signal_pending(current)) {
 			spin_unlock_irqrestore(&f->lock, flags);
@@ -239,7 +238,6 @@ int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file,
 /* change the size of pool; all old events are removed */
 int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize)
 {
-	unsigned long flags;
 	struct snd_seq_pool *newpool, *oldpool;
 	struct snd_seq_event_cell *cell, *next, *oldhead;
 
@@ -255,7 +253,7 @@ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize)
 		return -ENOMEM;
 	}
 
-	spin_lock_irqsave(&f->lock, flags);
+	spin_lock_irq(&f->lock);
 	/* remember old pool */
 	oldpool = f->pool;
 	oldhead = f->head;
@@ -265,7 +263,7 @@ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize)
 	f->tail = NULL;
 	f->cells = 0;
 	/* NOTE: overflow flag is not cleared */
-	spin_unlock_irqrestore(&f->lock, flags);
+	spin_unlock_irq(&f->lock);
 
 	/* close the old pool and wait until all users are gone */
 	snd_seq_pool_mark_closing(oldpool);

sound/core/seq/seq_memory.c

@@ -24,7 +24,7 @@
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/sched/signal.h>
-#include <linux/vmalloc.h>
+#include <linux/mm.h>
 #include <sound/core.h>
 
 #include <sound/seq_kernel.h>
@@ -244,13 +244,13 @@ static int snd_seq_cell_alloc(struct snd_seq_pool *pool,
 
 		set_current_state(TASK_INTERRUPTIBLE);
 		add_wait_queue(&pool->output_sleep, &wait);
-		spin_unlock_irq(&pool->lock);
+		spin_unlock_irqrestore(&pool->lock, flags);
 		if (mutexp)
 			mutex_unlock(mutexp);
 		schedule();
 		if (mutexp)
 			mutex_lock(mutexp);
-		spin_lock_irq(&pool->lock);
+		spin_lock_irqsave(&pool->lock, flags);
 		remove_wait_queue(&pool->output_sleep, &wait);
 		/* interrupted? */
 		if (signal_pending(current)) {
@@ -384,21 +384,20 @@ int snd_seq_pool_init(struct snd_seq_pool *pool)
 {
 	int cell;
 	struct snd_seq_event_cell *cellptr;
-	unsigned long flags;
 
 	if (snd_BUG_ON(!pool))
 		return -EINVAL;
 
-	cellptr = vmalloc(array_size(sizeof(struct snd_seq_event_cell),
-				     pool->size));
+	cellptr = kvmalloc_array(sizeof(struct snd_seq_event_cell), pool->size,
+				 GFP_KERNEL);
 	if (!cellptr)
 		return -ENOMEM;
 
 	/* add new cells to the free cell list */
-	spin_lock_irqsave(&pool->lock, flags);
+	spin_lock_irq(&pool->lock);
 	if (pool->ptr) {
-		spin_unlock_irqrestore(&pool->lock, flags);
-		vfree(cellptr);
+		spin_unlock_irq(&pool->lock);
+		kvfree(cellptr);
 		return 0;
 	}
 
@@ -416,7 +415,7 @@ int snd_seq_pool_init(struct snd_seq_pool *pool)
 	/* init statistics */
 	pool->max_used = 0;
 	pool->total_elements = pool->size;
-	spin_unlock_irqrestore(&pool->lock, flags);
+	spin_unlock_irq(&pool->lock);
 	return 0;
 }
 
@@ -435,7 +434,6 @@ void snd_seq_pool_mark_closing(struct snd_seq_pool *pool)
 /* remove events */
 int snd_seq_pool_done(struct snd_seq_pool *pool)
 {
-	unsigned long flags;
 	struct snd_seq_event_cell *ptr;
 
 	if (snd_BUG_ON(!pool))
@@ -449,18 +447,18 @@ int snd_seq_pool_done(struct snd_seq_pool *pool)
 		schedule_timeout_uninterruptible(1);
 	
 	/* release all resources */
-	spin_lock_irqsave(&pool->lock, flags);
+	spin_lock_irq(&pool->lock);
 	ptr = pool->ptr;
 	pool->ptr = NULL;
 	pool->free = NULL;
 	pool->total_elements = 0;
-	spin_unlock_irqrestore(&pool->lock, flags);
+	spin_unlock_irq(&pool->lock);
 
-	vfree(ptr);
+	kvfree(ptr);
 
-	spin_lock_irqsave(&pool->lock, flags);
+	spin_lock_irq(&pool->lock);
 	pool->closing = 0;
-	spin_unlock_irqrestore(&pool->lock, flags);
+	spin_unlock_irq(&pool->lock);
 
 	return 0;
 }

sound/core/seq/seq_ports.c

@@ -128,7 +128,6 @@ static void port_subs_info_init(struct snd_seq_port_subs_info *grp)
 struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client,
 						int port)
 {
-	unsigned long flags;
 	struct snd_seq_client_port *new_port, *p;
 	int num = -1;
 	
@@ -157,7 +156,7 @@ struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client,
 
 	num = port >= 0 ? port : 0;
 	mutex_lock(&client->ports_mutex);
-	write_lock_irqsave(&client->ports_lock, flags);
+	write_lock_irq(&client->ports_lock);
 	list_for_each_entry(p, &client->ports_list_head, list) {
 		if (p->addr.port > num)
 			break;
@@ -169,7 +168,7 @@ struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client,
 	client->num_ports++;
 	new_port->addr.port = num;	/* store the port number in the port */
 	sprintf(new_port->name, "port-%d", num);
-	write_unlock_irqrestore(&client->ports_lock, flags);
+	write_unlock_irq(&client->ports_lock);
 	mutex_unlock(&client->ports_mutex);
 
 	return new_port;
@@ -283,11 +282,10 @@ static int port_delete(struct snd_seq_client *client,
 /* delete a port with the given port id */
 int snd_seq_delete_port(struct snd_seq_client *client, int port)
 {
-	unsigned long flags;
 	struct snd_seq_client_port *found = NULL, *p;
 
 	mutex_lock(&client->ports_mutex);
-	write_lock_irqsave(&client->ports_lock, flags);
+	write_lock_irq(&client->ports_lock);
 	list_for_each_entry(p, &client->ports_list_head, list) {
 		if (p->addr.port == port) {
 			/* ok found.  delete from the list at first */
@@ -297,7 +295,7 @@ int snd_seq_delete_port(struct snd_seq_client *client, int port)
 			break;
 		}
 	}
-	write_unlock_irqrestore(&client->ports_lock, flags);
+	write_unlock_irq(&client->ports_lock);
 	mutex_unlock(&client->ports_mutex);
 	if (found)
 		return port_delete(client, found);
@@ -308,7 +306,6 @@ int snd_seq_delete_port(struct snd_seq_client *client, int port)
 /* delete the all ports belonging to the given client */
 int snd_seq_delete_all_ports(struct snd_seq_client *client)
 {
-	unsigned long flags;
 	struct list_head deleted_list;
 	struct snd_seq_client_port *port, *tmp;
 	
@@ -316,7 +313,7 @@ int snd_seq_delete_all_ports(struct snd_seq_client *client)
 	 * clear the port list in the client data.
 	 */
 	mutex_lock(&client->ports_mutex);
-	write_lock_irqsave(&client->ports_lock, flags);
+	write_lock_irq(&client->ports_lock);
 	if (! list_empty(&client->ports_list_head)) {
 		list_add(&deleted_list, &client->ports_list_head);
 		list_del_init(&client->ports_list_head);
@@ -324,7 +321,7 @@ int snd_seq_delete_all_ports(struct snd_seq_client *client)
 		INIT_LIST_HEAD(&deleted_list);
 	}
 	client->num_ports = 0;
-	write_unlock_irqrestore(&client->ports_lock, flags);
+	write_unlock_irq(&client->ports_lock);
 
 	/* remove each port in deleted_list */
 	list_for_each_entry_safe(port, tmp, &deleted_list, list) {
@@ -550,10 +547,10 @@ static void delete_and_unsubscribe_port(struct snd_seq_client *client,
 		list_del_init(list);
 	grp->exclusive = 0;
 	write_unlock_irq(&grp->list_lock);
-	up_write(&grp->list_mutex);
 
 	if (!empty)
 		unsubscribe_port(client, port, grp, &subs->info, ack);
+	up_write(&grp->list_mutex);
 }
 
 /* connect two ports */
@@ -635,20 +632,23 @@ int snd_seq_port_disconnect(struct snd_seq_client *connector,
 
 
 /* get matched subscriber */
-struct snd_seq_subscribers *snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp,
-							  struct snd_seq_addr *dest_addr)
+int snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp,
+				  struct snd_seq_addr *dest_addr,
+				  struct snd_seq_port_subscribe *subs)
 {
-	struct snd_seq_subscribers *s, *found = NULL;
+	struct snd_seq_subscribers *s;
+	int err = -ENOENT;
 
 	down_read(&src_grp->list_mutex);
 	list_for_each_entry(s, &src_grp->list_head, src_list) {
 		if (addr_match(dest_addr, &s->info.dest)) {
-			found = s;
+			*subs = s->info;
+			err = 0;
 			break;
 		}
 	}
 	up_read(&src_grp->list_mutex);
-	return found;
+	return err;
 }
 
 /*

sound/core/seq/seq_ports.h

@@ -135,7 +135,8 @@ int snd_seq_port_subscribe(struct snd_seq_client_port *port,
 			   struct snd_seq_port_subscribe *info);
 
 /* get matched subscriber */
-struct snd_seq_subscribers *snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp,
-							  struct snd_seq_addr *dest_addr);
+int snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp,
+				  struct snd_seq_addr *dest_addr,
+				  struct snd_seq_port_subscribe *subs);
 
 #endif