ALSA: oxfw: use managed-resource to maintain model-specific data

ALSA oxfw driver allocates memory objects for data specific to some
models. These objects are used to maintain functionalities specific
to the models for ALSA rawMIDI/control interfaces. They can be
released as managed-resource of 'struct snd_card.card_dev'.

This commit uses managed-resource of the sound card device for this
purpose.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/oxfw/oxfw-scs1x.c

@@ -372,8 +372,9 @@ int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw)
 	struct fw_scs1x *scs;
 	int err;
 
-	scs = kzalloc(sizeof(struct fw_scs1x), GFP_KERNEL);
-	if (scs == NULL)
+	scs = devm_kzalloc(&oxfw->card->card_dev, sizeof(struct fw_scs1x),
+			   GFP_KERNEL);
+	if (!scs)
 		return -ENOMEM;
 	scs->fw_dev = fw_parent_device(oxfw->unit);
 	oxfw->spec = scs;

sound/firewire/oxfw/oxfw-spkr.c

@@ -270,8 +270,9 @@ int snd_oxfw_add_spkr(struct snd_oxfw *oxfw, bool is_lacie)
 	unsigned int i, first_ch;
 	int err;
 
-	spkr = kzalloc(sizeof(struct fw_spkr), GFP_KERNEL);
-	if (spkr == NULL)
+	spkr = devm_kzalloc(&oxfw->card->card_dev, sizeof(struct fw_spkr),
+			    GFP_KERNEL);
+	if (!spkr)
 		return -ENOMEM;
 	oxfw->spec = spkr;
 

sound/firewire/oxfw/oxfw.c

@@ -126,7 +126,6 @@ static void oxfw_free(struct snd_oxfw *oxfw)
 		kfree(oxfw->rx_stream_formats[i]);
 	}
 
-	kfree(oxfw->spec);
 	mutex_destroy(&oxfw->mutex);
 	fw_unit_put(oxfw->unit);
 }
@@ -276,8 +275,6 @@ static void do_registration(struct work_struct *work)
 		oxfw->rx_stream_formats[i] = NULL;
 	}
 	snd_card_free(oxfw->card);
-	kfree(oxfw->spec);
-	oxfw->spec = NULL;
 	dev_info(&oxfw->unit->device,
 		 "Sound card registration failed: %d\n", err);
 }