unimore/kernel-hacking-2024-linux-steffo
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ALSA: ump: Force 1 Group for MIDI1 FBs

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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: 37e0e14128 ("ALSA: ump: Support UMP Endpoint and Function Block parsing")
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20240722140610.10845-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2024-07-22 16:06:06 +02:00
parent 9a4ab167cf
commit ac29d8ae05
1 changed files with 6 additions and 0 deletions
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6
sound/core/ump.c
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@ -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 */