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alsa: seq: double-check midi client version

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Check midi client version after setting it, to see if it was really
successfully set.  Old kernels without UMP don't know about the midi
version fields, so snd_seq_set_client_midi_version() appears to fail
silently there.
This commit is contained in:
Pauli Virtanen 2025-03-20 20:35:46 +02:00
parent e0938303e6
commit 6fe1c6d67b
1 changed files with 18 additions and 0 deletions
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18
spa/plugins/alsa/alsa-seq.c
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@ -44,9 +44,27 @@ static int seq_open(struct seq_state *state, struct seq_conn *conn, bool with_qu
#ifdef HAVE_ALSA_UMP
res = snd_seq_set_client_midi_version(conn->hndl, SND_SEQ_CLIENT_UMP_MIDI_2_0);
if (!res) {
snd_seq_client_info_t *info = NULL;
/* Double check client version */
res = snd_seq_client_info_malloc(&info);
if (!res)
res = snd_seq_get_client_info(conn->hndl, info);
if (!res) {
res = snd_seq_client_info_get_midi_version(info);
if (res == SND_SEQ_CLIENT_UMP_MIDI_2_0)
res = 0;
else
res = -EIO;
}
if (info)
snd_seq_client_info_free(info);
}
#else
res = -EOPNOTSUPP;
#endif
if (res < 0) {
spa_log_lev(state->log, (probe_ump ? SPA_LOG_LEVEL_INFO : SPA_LOG_LEVEL_ERROR),
"%p: ALSA failed to enable UMP MIDI: %s", state, snd_strerror(res));