ALSA: oxfw: use managed-resource to maintain cache of stream formats

ALSA oxfw driver allocates memory objects for cache of stream formats.
The objects are used to maintain packet streaming by components for
ALSA rawMIDI/PCM interface. 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-stream.c

@@ -517,8 +517,9 @@ assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
 	if (err < 0)
 		goto end;
 
-	formats[eid] = kmemdup(buf, *len, GFP_KERNEL);
-	if (formats[eid] == NULL) {
+	formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
+				    GFP_KERNEL);
+	if (!formats[eid]) {
 		err = -ENOMEM;
 		goto end;
 	}
@@ -535,7 +536,8 @@ assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
 			continue;
 
 		eid++;
-		formats[eid] = kmemdup(buf, *len, GFP_KERNEL);
+		formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
+					    GFP_KERNEL);
 		if (formats[eid] == NULL) {
 			err = -ENOMEM;
 			goto end;
@@ -597,8 +599,9 @@ static int fill_stream_formats(struct snd_oxfw *oxfw,
 		if (err < 0)
 			break;
 
-		formats[eid] = kmemdup(buf, len, GFP_KERNEL);
-		if (formats[eid] == NULL) {
+		formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len,
+					    GFP_KERNEL);
+		if (!formats[eid]) {
 			err = -ENOMEM;
 			break;
 		}

sound/firewire/oxfw/oxfw.c

@@ -115,17 +115,10 @@ end:
 
 static void oxfw_free(struct snd_oxfw *oxfw)
 {
-	unsigned int i;
-
 	snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
 	if (oxfw->has_output)
 		snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
 
-	for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
-		kfree(oxfw->tx_stream_formats[i]);
-		kfree(oxfw->rx_stream_formats[i]);
-	}
-
 	mutex_destroy(&oxfw->mutex);
 	fw_unit_put(oxfw->unit);
 }
@@ -205,7 +198,6 @@ static int detect_quirks(struct snd_oxfw *oxfw)
 static void do_registration(struct work_struct *work)
 {
 	struct snd_oxfw *oxfw = container_of(work, struct snd_oxfw, dwork.work);
-	int i;
 	int err;
 
 	if (oxfw->registered)
@@ -268,12 +260,6 @@ error:
 	snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
 	if (oxfw->has_output)
 		snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
-	for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; ++i) {
-		kfree(oxfw->tx_stream_formats[i]);
-		oxfw->tx_stream_formats[i] = NULL;
-		kfree(oxfw->rx_stream_formats[i]);
-		oxfw->rx_stream_formats[i] = NULL;
-	}
 	snd_card_free(oxfw->card);
 	dev_info(&oxfw->unit->device,
 		 "Sound card registration failed: %d\n", err);