ALSA: seq: ump: Notify port changes to system port

For allowing applications to track the FB active changes, this patch
adds the notification from the system port at each time a FB change is
handled and the active flag or re-grouping happens.

Link: https://lore.kernel.org/r/20230612081054.17200-8-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/seq/seq_system.c

@@ -85,6 +85,7 @@ void snd_seq_system_broadcast(int client, int port, int type)
 	ev.type = type;
 	snd_seq_kernel_client_dispatch(sysclient, &ev, 0, 0);
 }
+EXPORT_SYMBOL_GPL(snd_seq_system_broadcast);
 
 /* entry points for broadcasting system events */
 int snd_seq_system_notify(int client, int port, struct snd_seq_event *ev)

sound/core/seq/seq_ump_client.c

@@ -13,6 +13,7 @@
 #include <sound/seq_kernel.h>
 #include <sound/seq_device.h>
 #include "seq_clientmgr.h"
+#include "seq_system.h"
 
 struct seq_ump_client;
 struct seq_ump_group;
@@ -273,6 +274,8 @@ static void update_port_infos(struct seq_ump_client *client)
 						new);
 		if (err < 0)
 			goto error;
+		/* notify to system port */
+		snd_seq_system_client_ev_port_change(client->seq_client, i);
 	}
  error:
 	kfree(new);