add audio

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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/sound/firewire/dice/dice-midi.c
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@@ -1,9 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * dice_midi.c - a part of driver for Dice based devices
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  *
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  * Copyright (c) 2014 Takashi Sakamoto
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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 "dice.h"
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@@ -18,8 +17,13 @@
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 	mutex_lock(&dice->mutex);
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-	dice->substreams_counter++;
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-	err = snd_dice_stream_start_duplex(dice, 0);
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+	err = snd_dice_stream_reserve_duplex(dice, 0, 0, 0);
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+	if (err >= 0) {
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+		++dice->substreams_counter;
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+		err = snd_dice_stream_start_duplex(dice);
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+		if (err < 0)
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+			--dice->substreams_counter;
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+	}
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 	mutex_unlock(&dice->mutex);
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@@ -35,7 +39,7 @@
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 	mutex_lock(&dice->mutex);
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-	dice->substreams_counter--;
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+	--dice->substreams_counter;
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 	snd_dice_stream_stop_duplex(dice);
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 	mutex_unlock(&dice->mutex);