ALSA: seq: ump: Fix seq port updates per FB info notify

update_port_infos() is called when a UMP FB Info update notification
is received, and this function is supposed to update the attributes of
the corresponding sequencer port.  However, the function had a few
issues and it brought to the incorrect states.  Namely:

- It tried to get a wrong sequencer info for the update without
  correcting the port number with the group-offset 1
- The loop exited immediately when a sequencer port isn't present;
  this ended up with the truncation if a sequencer port in the middle
  goes away

This patch addresses those bugs.

Fixes: 4a16a3a ("ALSA: seq: ump: Handle FB info update")
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

Author: tiwai

sound/core/seq/seq_ump_client.c

@@ -257,12 +257,12 @@ static void update_port_infos(struct seq_ump_client *client)
 			continue;
 
 		old->addr.client = client->seq_client;
-		old->addr.port = i;
+		old->addr.port = ump_group_to_seq_port(i);
 		err = snd_seq_kernel_client_ctl(client->seq_client,
 						SNDRV_SEQ_IOCTL_GET_PORT_INFO,
 						old);
 		if (err < 0)
-			return;
+			continue;
 		fill_port_info(new, client, &client->ump->groups[i]);
 		if (old->capability == new->capability &&
 		    !strcmp(old->name, new->name))
@@ -271,7 +271,7 @@ static void update_port_infos(struct seq_ump_client *client)
 						SNDRV_SEQ_IOCTL_SET_PORT_INFO,
 						new);
 		if (err < 0)
-			return;
+			continue;
 		/* notify to system port */
 		snd_seq_system_client_ev_port_change(client->seq_client, i);
 	}