ALSA: hwdep: Don't embed device

Like control and PCM devices, it's better to avoid the embedded struct
device for hwdep (although it's more or less well working), too.
Change it to allocate via snd_device_alloc(), and free the memory at
the common snd_hwdep_free().

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20230816160252.23396-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hwdep.h

@@ -53,7 +53,7 @@ struct snd_hwdep {
 	wait_queue_head_t open_wait;
 	void *private_data;
 	void (*private_free) (struct snd_hwdep *hwdep);
-	struct device dev;
+	struct device *dev;
 
 	struct mutex open_mutex;
 	int used;			/* reference counter */

sound/core/hwdep.c

@@ -338,9 +338,14 @@ static const struct file_operations snd_hwdep_f_ops =
 	.mmap =		snd_hwdep_mmap,
 };
 
-static void release_hwdep_device(struct device *dev)
+static void snd_hwdep_free(struct snd_hwdep *hwdep)
 {
-	kfree(container_of(dev, struct snd_hwdep, dev));
+	if (!hwdep)
+		return;
+	if (hwdep->private_free)
+		hwdep->private_free(hwdep);
+	put_device(hwdep->dev);
+	kfree(hwdep);
 }
 
 /**
@@ -382,16 +387,20 @@ int snd_hwdep_new(struct snd_card *card, char *id, int device,
 	if (id)
 		strscpy(hwdep->id, id, sizeof(hwdep->id));
 
-	snd_device_initialize(&hwdep->dev, card);
-	hwdep->dev.release = release_hwdep_device;
-	dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
+	err = snd_device_alloc(&hwdep->dev, card);
+	if (err < 0) {
+		snd_hwdep_free(hwdep);
+		return err;
+	}
+
+	dev_set_name(hwdep->dev, "hwC%iD%i", card->number, device);
 #ifdef CONFIG_SND_OSSEMUL
 	hwdep->oss_type = -1;
 #endif
 
 	err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
 	if (err < 0) {
-		put_device(&hwdep->dev);
+		snd_hwdep_free(hwdep);
 		return err;
 	}
 
@@ -403,12 +412,7 @@ EXPORT_SYMBOL(snd_hwdep_new);
 
 static int snd_hwdep_dev_free(struct snd_device *device)
 {
-	struct snd_hwdep *hwdep = device->device_data;
-	if (!hwdep)
-		return 0;
-	if (hwdep->private_free)
-		hwdep->private_free(hwdep);
-	put_device(&hwdep->dev);
+	snd_hwdep_free(device->device_data);
 	return 0;
 }
 
@@ -426,9 +430,9 @@ static int snd_hwdep_dev_register(struct snd_device *device)
 	list_add_tail(&hwdep->list, &snd_hwdep_devices);
 	err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
 				  hwdep->card, hwdep->device,
-				  &snd_hwdep_f_ops, hwdep, &hwdep->dev);
+				  &snd_hwdep_f_ops, hwdep, hwdep->dev);
 	if (err < 0) {
-		dev_err(&hwdep->dev, "unable to register\n");
+		dev_err(hwdep->dev, "unable to register\n");
 		list_del(&hwdep->list);
 		mutex_unlock(&register_mutex);
 		return err;
@@ -439,12 +443,12 @@ static int snd_hwdep_dev_register(struct snd_device *device)
 	if (hwdep->oss_type >= 0) {
 		if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
 		    hwdep->device)
-			dev_warn(&hwdep->dev,
+			dev_warn(hwdep->dev,
 				 "only hwdep device 0 can be registered as OSS direct FM device!\n");
 		else if (snd_register_oss_device(hwdep->oss_type,
 						 card, hwdep->device,
 						 &snd_hwdep_f_ops, hwdep) < 0)
-			dev_warn(&hwdep->dev,
+			dev_warn(hwdep->dev,
 				 "unable to register OSS compatibility device\n");
 		else
 			hwdep->ossreg = 1;
@@ -471,7 +475,7 @@ static int snd_hwdep_dev_disconnect(struct snd_device *device)
 	if (hwdep->ossreg)
 		snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
 #endif
-	snd_unregister_device(&hwdep->dev);
+	snd_unregister_device(hwdep->dev);
 	list_del_init(&hwdep->list);
 	mutex_unlock(&hwdep->open_mutex);
 	mutex_unlock(&register_mutex);

sound/pci/hda/hda_hwdep.c

@@ -114,8 +114,8 @@ int snd_hda_create_hwdep(struct hda_codec *codec)
 #endif
 
 	/* for sysfs */
-	hwdep->dev.groups = snd_hda_dev_attr_groups;
-	dev_set_drvdata(&hwdep->dev, codec);
+	hwdep->dev->groups = snd_hda_dev_attr_groups;
+	dev_set_drvdata(hwdep->dev, codec);
 
 	return 0;
 }