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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/sound/firewire/motu/motu-midi.c
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@@ -1,13 +1,12 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * motu-midi.h - a part of driver for MOTU FireWire series
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  *
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  * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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- *
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- * Licensed under the terms of the GNU General Public License, version 2.
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  */
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 #include "motu.h"
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-static int midi_capture_open(struct snd_rawmidi_substream *substream)
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+static int midi_open(struct snd_rawmidi_substream *substream)
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 {
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 	struct snd_motu *motu = substream->rmidi->private_data;
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 	int err;
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@@ -18,8 +17,13 @@
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 	mutex_lock(&motu->mutex);
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-	motu->capture_substreams++;
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-	err = snd_motu_stream_start_duplex(motu, 0);
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+	err = snd_motu_stream_reserve_duplex(motu, 0, 0, 0);
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+	if (err >= 0) {
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+		++motu->substreams_counter;
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+		err = snd_motu_stream_start_duplex(motu);
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+		if (err < 0)
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+			--motu->substreams_counter;
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+	}
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 	mutex_unlock(&motu->mutex);
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@@ -29,50 +33,13 @@
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 	return err;
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 }
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-static int midi_playback_open(struct snd_rawmidi_substream *substream)
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-{
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-	struct snd_motu *motu = substream->rmidi->private_data;
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-	int err;
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-
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-	err = snd_motu_stream_lock_try(motu);
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-	if (err < 0)
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-		return err;
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-
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-	mutex_lock(&motu->mutex);
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-
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-	motu->playback_substreams++;
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-	err = snd_motu_stream_start_duplex(motu, 0);
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-
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-	mutex_unlock(&motu->mutex);
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-
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-	if (err < 0)
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-		snd_motu_stream_lock_release(motu);
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-
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-	return err;
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-}
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-
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-static int midi_capture_close(struct snd_rawmidi_substream *substream)
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+static int midi_close(struct snd_rawmidi_substream *substream)
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 {
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 	struct snd_motu *motu = substream->rmidi->private_data;
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 	mutex_lock(&motu->mutex);
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-	motu->capture_substreams--;
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-	snd_motu_stream_stop_duplex(motu);
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-
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-	mutex_unlock(&motu->mutex);
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-
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-	snd_motu_stream_lock_release(motu);
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-	return 0;
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-}
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-
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-static int midi_playback_close(struct snd_rawmidi_substream *substream)
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-{
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-	struct snd_motu *motu = substream->rmidi->private_data;
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-
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-	mutex_lock(&motu->mutex);
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-
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-	motu->playback_substreams--;
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+	--motu->substreams_counter;
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 	snd_motu_stream_stop_duplex(motu);
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 	mutex_unlock(&motu->mutex);
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@@ -129,13 +96,13 @@
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 int snd_motu_create_midi_devices(struct snd_motu *motu)
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 {
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 	static const struct snd_rawmidi_ops capture_ops = {
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-		.open		= midi_capture_open,
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-		.close		= midi_capture_close,
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+		.open		= midi_open,
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+		.close		= midi_close,
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 		.trigger	= midi_capture_trigger,
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 	};
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 	static const struct snd_rawmidi_ops playback_ops = {
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-		.open		= midi_playback_open,
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-		.close		= midi_playback_close,
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+		.open		= midi_open,
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+		.close		= midi_close,
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 		.trigger	= midi_playback_trigger,
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 	};
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 	struct snd_rawmidi *rmidi;