6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Takashi Iwai <tiwai@xxxxxxx>
commit ac29d8ae05b770ed3f52d7a60908ab9b126f69d7 upstream.
When a Function Block declares it being a legacy MIDI1 device, it has
to be only with a single UMP Group. Correct the attribute when a
device declares it wrongly.
Fixes: 37e0e14128e0 ("ALSA: ump: Support UMP Endpoint and Function Block parsing")
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20240722140610.10845-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/ump.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/sound/core/ump.c b/sound/core/ump.c
index b325fcfa77d0..0f0d7e895c5a 100644
--- a/sound/core/ump.c
+++ b/sound/core/ump.c
@@ -733,6 +733,12 @@ static void fill_fb_info(struct snd_ump_endpoint *ump,
info->block_id, info->direction, info->active,
info->first_group, info->num_groups, info->midi_ci_version,
info->sysex8_streams, info->flags);
+
+ if ((info->flags & SNDRV_UMP_BLOCK_IS_MIDI1) && info->num_groups != 1) {
+ info->num_groups = 1;
+ ump_dbg(ump, "FB %d: corrected groups to 1 for MIDI1\n",
+ info->block_id);
+ }
}
/* check whether the FB info gets updated by the current message */
--
2.45.2
