enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/sound/firewire/digi00x/digi00x-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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  * digi00x-midi.h - a part of driver for Digidesign Digi 002/003 family
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  *
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  * Copyright (c) 2014-2015 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 "digi00x.h"
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@@ -18,8 +17,13 @@
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 		return err;
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 	mutex_lock(&dg00x->mutex);
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-	dg00x->substreams_counter++;
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-	err = snd_dg00x_stream_start_duplex(dg00x, 0);
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+	err = snd_dg00x_stream_reserve_duplex(dg00x, 0, 0, 0);
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+	if (err >= 0) {
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+		++dg00x->substreams_counter;
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+		err = snd_dg00x_stream_start_duplex(dg00x);
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+		if (err < 0)
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+			--dg00x->substreams_counter;
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+	}
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 	mutex_unlock(&dg00x->mutex);
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 	if (err < 0)
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 		snd_dg00x_stream_lock_release(dg00x);
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@@ -32,7 +36,7 @@
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 	struct snd_dg00x *dg00x = substream->rmidi->private_data;
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 	mutex_lock(&dg00x->mutex);
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-	dg00x->substreams_counter--;
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+	--dg00x->substreams_counter;
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 	snd_dg00x_stream_stop_duplex(dg00x);
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 	mutex_unlock(&dg00x->mutex);
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