ALSA: als300: Allocate resources with device-managed APIs

This patch converts the resource management in PCI als300 driver with
devres as a clean up.  Each manual resource management is converted
with the corresponding devres helper, and the card object release is
managed now via card->private_free instead of a lowlevel snd_device.

This should give no user-visible functional changes.

Link: https://lore.kernel.org/r/20210715075941.23332-10-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/als300.c

@@ -163,21 +163,11 @@ static void snd_als300_set_irq_flag(struct snd_als300 *chip, int cmd)
 	snd_als300_gcr_write(chip->port, MISC_CONTROL, tmp);
 }
 
-static int snd_als300_free(struct snd_als300 *chip)
+static void snd_als300_free(struct snd_card *card)
 {
-	snd_als300_set_irq_flag(chip, IRQ_DISABLE);
-	if (chip->irq >= 0)
-		free_irq(chip->irq, chip);
-	pci_release_regions(chip->pci);
-	pci_disable_device(chip->pci);
-	kfree(chip);
-	return 0;
-}
+	struct snd_als300 *chip = card->private_data;
 
-static int snd_als300_dev_free(struct snd_device *device)
-{
-	struct snd_als300 *chip = device->device_data;
-	return snd_als300_free(chip);
+	snd_als300_set_irq_flag(chip, IRQ_DISABLE);
 }
 
 static irqreturn_t snd_als300_interrupt(int irq, void *dev_id)
@@ -248,11 +238,6 @@ static irqreturn_t snd_als300plus_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static void snd_als300_remove(struct pci_dev *pci)
-{
-	snd_card_free(pci_get_drvdata(pci));
-}
-
 static unsigned short snd_als300_ac97_read(struct snd_ac97 *ac97,
 							unsigned short reg)
 {
@@ -610,35 +595,22 @@ static void snd_als300_init(struct snd_als300 *chip)
 }
 
 static int snd_als300_create(struct snd_card *card,
-			     struct pci_dev *pci, int chip_type,
-			     struct snd_als300 **rchip)
+			     struct pci_dev *pci, int chip_type)
 {
-	struct snd_als300 *chip;
+	struct snd_als300 *chip = card->private_data;
 	void *irq_handler;
 	int err;
 
-	static const struct snd_device_ops ops = {
-		.dev_free = snd_als300_dev_free,
-	};
-	*rchip = NULL;
-
-	err = pci_enable_device(pci);
+	err = pcim_enable_device(pci);
 	if (err < 0)
 		return err;
 
 	if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(28))) {
 		dev_err(card->dev, "error setting 28bit DMA mask\n");
-		pci_disable_device(pci);
 		return -ENXIO;
 	}
 	pci_set_master(pci);
 
-	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-	if (chip == NULL) {
-		pci_disable_device(pci);
-		return -ENOMEM;
-	}
-
 	chip->card = card;
 	chip->pci = pci;
 	chip->irq = -1;
@@ -646,11 +618,9 @@ static int snd_als300_create(struct snd_card *card,
 	spin_lock_init(&chip->reg_lock);
 
 	err = pci_request_regions(pci, "ALS300");
-	if (err < 0) {
-		kfree(chip);
-		pci_disable_device(pci);
+	if (err < 0)
 		return err;
-	}
+
 	chip->port = pci_resource_start(pci, 0);
 
 	if (chip->chip_type == DEVICE_ALS300_PLUS)
@@ -658,38 +628,29 @@ static int snd_als300_create(struct snd_card *card,
 	else
 		irq_handler = snd_als300_interrupt;
 
-	if (request_irq(pci->irq, irq_handler, IRQF_SHARED,
-			KBUILD_MODNAME, chip)) {
+	if (devm_request_irq(&pci->dev, pci->irq, irq_handler, IRQF_SHARED,
+			     KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
-		snd_als300_free(chip);
 		return -EBUSY;
 	}
 	chip->irq = pci->irq;
 	card->sync_irq = chip->irq;
+	card->private_free = snd_als300_free;
 
 	snd_als300_init(chip);
 
 	err = snd_als300_ac97(chip);
 	if (err < 0) {
 		dev_err(card->dev, "Could not create ac97\n");
-		snd_als300_free(chip);
 		return err;
 	}
 
 	err = snd_als300_new_pcm(chip);
 	if (err < 0) {
 		dev_err(card->dev, "Could not create PCM\n");
-		snd_als300_free(chip);
-		return err;
-	}
-
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		snd_als300_free(chip);
 		return err;
 	}
 
-	*rchip = chip;
 	return 0;
 }
 
@@ -737,20 +698,16 @@ static int snd_als300_probe(struct pci_dev *pci,
 		return -ENOENT;
 	}
 
-	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
-			   0, &card);
-
+	err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
+				sizeof(*chip), &card);
 	if (err < 0)
 		return err;
 
 	chip_type = pci_id->driver_data;
 
-	err = snd_als300_create(card, pci, chip_type, &chip);
-	if (err < 0) {
-		snd_card_free(card);
+	err = snd_als300_create(card, pci, chip_type);
+	if (err < 0)
 		return err;
-	}
-	card->private_data = chip;
 
 	strcpy(card->driver, "ALS300");
 	if (chip->chip_type == DEVICE_ALS300_PLUS)
@@ -764,10 +721,9 @@ static int snd_als300_probe(struct pci_dev *pci,
 				card->shortname, chip->port, chip->irq);
 
 	err = snd_card_register(card);
-	if (err < 0) {
-		snd_card_free(card);
+	if (err < 0)
 		return err;
-	}
+
 	pci_set_drvdata(pci, card);
 	dev++;
 	return 0;
@@ -777,7 +733,6 @@ static struct pci_driver als300_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = snd_als300_ids,
 	.probe = snd_als300_probe,
-	.remove = snd_als300_remove,
 	.driver = {
 		.pm = SND_ALS300_PM_OPS,
 	},