ALSA: ump: Don't update FB name for static blocks

BugLink: https://bugs.launchpad.net/bugs/2083196

commit 9a4ab167cfb1dea1df0c0c948205a62c7eb3b85b upstream.

When a device tries to update the FB name string even if its Endpoint
is declared as static, we should skip it, just already done for the FB
info update reply.

Fixes: 37e0e14128 ("ALSA: ump: Support UMP Endpoint and Function Block parsing")
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20240722135929.8612-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>

sound/core/ump.c

@@ -806,6 +806,13 @@ static int ump_handle_fb_name_msg(struct snd_ump_endpoint *ump,
 	if (!fb)
 		return -ENODEV;
 
+	if (ump->parsed &&
+	    (ump->info.flags & SNDRV_UMP_EP_INFO_STATIC_BLOCKS)) {
+		ump_dbg(ump, "Skipping static FB name update (blk#%d)\n",
+			fb->info.block_id);
+		return 0;
+	}
+
 	ret = ump_append_string(ump, fb->info.name, sizeof(fb->info.name),
 				buf->raw, 3);
 	/* notify the FB name update to sequencer, too */