[alsa-devel] [PATCH 3/5] ALSA: dice: ensure to release sound devices after sound card registration fails

[Takashi Sakamoto]

When work of sound card registration fails, bus reset on IEEE 1394
can schedule the work again. In this case, currently instances of PCM and
RawMIDI devices are not released, but allocated and errors occurs.

This commit solves this issue. The allocated data is kept and released
at any failures in the work.

Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
 sound/firewire/dice/dice-midi.c |  2 ++
 sound/firewire/dice/dice-pcm.c  |  2 ++
 sound/firewire/dice/dice.c      | 30 +++++++++++++++++++++---------
 sound/firewire/dice/dice.h      |  2 ++
 4 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/sound/firewire/dice/dice-midi.c b/sound/firewire/dice/dice-midi.c
index 151b09f..908b43f 100644
--- a/sound/firewire/dice/dice-midi.c
+++ b/sound/firewire/dice/dice-midi.c
@@ -153,5 +153,7 @@ int snd_dice_create_midi(struct snd_dice *dice)
 	if ((midi_out_ports > 0) && (midi_in_ports > 0))
 		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 
+	dice->rmidi_dev = rmidi;
+
 	return 0;
 }
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index 9b34319..6246ce3 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -426,5 +426,7 @@ int snd_dice_create_pcm(struct snd_dice *dice)
 	if (playback > 0)
 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
 
+	dice->pcm_dev = pcm;
+
 	return 0;
 }
diff --git a/sound/firewire/dice/dice.c b/sound/firewire/dice/dice.c
index 0bc7d08..21ad894 100644
--- a/sound/firewire/dice/dice.c
+++ b/sound/firewire/dice/dice.c
@@ -202,33 +202,45 @@ static void do_registration(struct work_struct *work)
 	if (dice->card->shutdown || dice->registered)
 		return;
 
+	dice->pcm_dev = NULL;
+	dice->rmidi_dev = NULL;
+
 	err = snd_dice_transaction_init(dice);
 	if (err < 0)
-		goto end;
+		goto error;
 
 	err = dice_read_params(dice);
 	if (err < 0)
-		goto end;
+		goto error;
 
 	dice_card_strings(dice);
 
 	err = snd_dice_create_pcm(dice);
 	if (err < 0)
-		goto end;
+		goto error;
 
 	err = snd_dice_create_midi(dice);
 	if (err < 0)
-		goto end;
+		goto error;
 
 	err = snd_card_register(dice->card);
 	if (err < 0)
-		goto end;
+		goto error;
 
 	dice->registered = true;
-end:
-	if (err < 0)
-		dev_info(&dice->unit->device,
-			 "Sound card registration failed: %d\n", err);
+
+	return;
+error:
+	snd_dice_transaction_destroy(dice);
+
+	if (dice->pcm_dev)
+		snd_device_free(dice->card, dice->pcm_dev);
+
+	if (dice->rmidi_dev)
+		snd_device_free(dice->card, dice->rmidi_dev);
+
+	dev_info(&dice->unit->device,
+		 "Sound card registration failed: %d\n", err);
 }
 
 static void schedule_registration(struct snd_dice *dice)
diff --git a/sound/firewire/dice/dice.h b/sound/firewire/dice/dice.h
index 3d5ebeb..d632ac1 100644
--- a/sound/firewire/dice/dice.h
+++ b/sound/firewire/dice/dice.h
@@ -47,6 +47,8 @@ struct snd_dice {
 
 	bool registered;
 	struct delayed_work dwork;
+	struct snd_pcm *pcm_dev;
+	struct snd_rawmidi *rmidi_dev;
 
 	/* Offsets for sub-addresses */
 	unsigned int global_offset;
-- 
2.5.0