2 files changed, 24 insertions, 0 deletions
diff --git a/sound/core/seq/seq_ump_client.c b/sound/core/seq/seq_ump_client.c
index f26a1812dfa7..a60e3f069a80 100644
--- a/sound/core/seq/seq_ump_client.c
+++ b/sound/core/seq/seq_ump_client.c
@@ -416,6 +416,25 @@ static void setup_client_midi_version(struct seq_ump_client *client)
 	snd_seq_kernel_client_put(cptr);
 }
 
+/* set up client's group_filter bitmap */
+static void setup_client_group_filter(struct seq_ump_client *client)
+{
+	struct snd_seq_client *cptr;
+	unsigned int filter;
+	int p;
+
+	cptr = snd_seq_kernel_client_get(client->seq_client);
+	if (!cptr)
+		return;
+	filter = ~(1U << 0); /* always allow groupless messages */
+	for (p = 0; p < SNDRV_UMP_MAX_GROUPS; p++) {
+		if (client->groups[p].active)
+			filter &= ~(1U << (p + 1));
+	}
+	cptr->group_filter = filter;
+	snd_seq_kernel_client_put(cptr);
+}
+
 /* UMP group change notification */
 static void handle_group_notify(struct work_struct *work)
 {
@@ -424,6 +443,7 @@ static void handle_group_notify(struct work_struct *work)
 
 	update_group_attrs(client);
 	update_port_infos(client);
+	setup_client_group_filter(client);
 }
 
 /* UMP FB change notification */
@@ -492,6 +512,8 @@ static int snd_seq_ump_probe(struct device *_dev)
 			goto error;
 	}
 
+	setup_client_group_filter(client);
+
 	err = create_ump_endpoint_port(client);
 	if (err < 0)
 		goto error;
diff --git a/sound/core/seq/seq_ump_convert.c b/sound/core/seq/seq_ump_convert.c
index 7cc84e137999..b141024830ec 100644
--- a/sound/core/seq/seq_ump_convert.c
+++ b/sound/core/seq/seq_ump_convert.c
@@ -1197,6 +1197,8 @@ int snd_seq_deliver_to_ump(struct snd_seq_client *source,
 			   struct snd_seq_event *event,
 			   int atomic, int hop)
 {
+	if (dest->group_filter & (1U << dest_port->ump_group))
+		return 0; /* group filtered - skip the event */
 	if (event->type == SNDRV_SEQ_EVENT_SYSEX)
 		return cvt_sysex_to_ump(dest, dest_port, event, atomic, hop);
 	else if (snd_seq_client_is_midi2(dest))