ALSA: wss: Allocate resources with device-managed APIs

This patch converts the resource management in ISA wss driver with
devres as a clean up. Each manual resource management is converted
with the corresponding devres helper. Since the whole destructor code
could be removed by the conversion, the lowlevel snd_device was
dropped as well.

This should give no user-visible functional changes.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/isa/cs423x/cs4236_lib.c

···
 	if (cport < 0x100 || cport == SNDRV_AUTO_PORT) {
 		snd_printk(KERN_ERR "please, specify control port "
 			   "for CS4236+ chips\n");
-		snd_device_free(card, chip);
 		return -ENODEV;
 	}
 	ver1 = snd_cs4236_ctrl_in(chip, 1);
···
 	if (ver1 != ver2) {
 		snd_printk(KERN_ERR "CS4236+ chip detected, but "
 			   "control port 0x%lx is not valid\n", cport);
-		snd_device_free(card, chip);
 		return -ENODEV;
 	}
 	snd_cs4236_ctrl_out(chip, 0, 0x00);

sound/isa/wss/wss_lib.c

···
 }
 #endif /* CONFIG_PM */
 
-static int snd_wss_free(struct snd_wss *chip)
-{
-	release_and_free_resource(chip->res_port);
-	release_and_free_resource(chip->res_cport);
-	if (chip->irq >= 0) {
-		disable_irq(chip->irq);
-		if (!(chip->hwshare & WSS_HWSHARE_IRQ))
-			free_irq(chip->irq, (void *) chip);
-	}
-	if (!(chip->hwshare & WSS_HWSHARE_DMA1) && chip->dma1 >= 0) {
-		snd_dma_disable(chip->dma1);
-		free_dma(chip->dma1);
-	}
-	if (!(chip->hwshare & WSS_HWSHARE_DMA2) &&
-	    chip->dma2 >= 0 && chip->dma2 != chip->dma1) {
-		snd_dma_disable(chip->dma2);
-		free_dma(chip->dma2);
-	}
-	if (chip->timer)
-		snd_device_free(chip->card, chip->timer);
-	kfree(chip);
-	return 0;
-}
-
-static int snd_wss_dev_free(struct snd_device *device)
-{
-	struct snd_wss *chip = device->device_data;
-	return snd_wss_free(chip);
-}
-
 const char *snd_wss_chip_id(struct snd_wss *chip)
 {
 	switch (chip->hardware) {
···
 	struct snd_wss *chip;
 
 	*rchip = NULL;
-	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+	chip = devm_kzalloc(card->dev, sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL)
 		return -ENOMEM;
 	chip->hardware = hardware;
···
 		      unsigned short hwshare,
 		      struct snd_wss **rchip)
 {
-	static const struct snd_device_ops ops = {
-		.dev_free =	snd_wss_dev_free,
-	};
 	struct snd_wss *chip;
 	int err;
 
···
 	chip->dma1 = -1;
 	chip->dma2 = -1;
 
-	chip->res_port = request_region(port, 4, "WSS");
+	chip->res_port = devm_request_region(card->dev, port, 4, "WSS");
 	if (!chip->res_port) {
 		snd_printk(KERN_ERR "wss: can't grab port 0x%lx\n", port);
-		snd_wss_free(chip);
 		return -EBUSY;
 	}
 	chip->port = port;
 	if ((long)cport >= 0) {
-		chip->res_cport = request_region(cport, 8, "CS4232 Control");
+		chip->res_cport = devm_request_region(card->dev, cport, 8,
+						      "CS4232 Control");
 		if (!chip->res_cport) {
 			snd_printk(KERN_ERR
 				"wss: can't grab control port 0x%lx\n", cport);
-			snd_wss_free(chip);
 			return -ENODEV;
 		}
 	}
 	chip->cport = cport;
 	if (!(hwshare & WSS_HWSHARE_IRQ))
-		if (request_irq(irq, snd_wss_interrupt, 0,
-				"WSS", (void *) chip)) {
+		if (devm_request_irq(card->dev, irq, snd_wss_interrupt, 0,
+				     "WSS", (void *) chip)) {
 			snd_printk(KERN_ERR "wss: can't grab IRQ %d\n", irq);
-			snd_wss_free(chip);
 			return -EBUSY;
 		}
 	chip->irq = irq;
 	card->sync_irq = chip->irq;
-	if (!(hwshare & WSS_HWSHARE_DMA1) && request_dma(dma1, "WSS - 1")) {
+	if (!(hwshare & WSS_HWSHARE_DMA1) &&
+	    snd_devm_request_dma(card->dev, dma1, "WSS - 1")) {
 		snd_printk(KERN_ERR "wss: can't grab DMA1 %d\n", dma1);
-		snd_wss_free(chip);
 		return -EBUSY;
 	}
 	chip->dma1 = dma1;
-	if (!(hwshare & WSS_HWSHARE_DMA2) && dma1 != dma2 &&
-	      dma2 >= 0 && request_dma(dma2, "WSS - 2")) {
+	if (!(hwshare & WSS_HWSHARE_DMA2) && dma1 != dma2 && dma2 >= 0 &&
+	    snd_devm_request_dma(card->dev, dma2, "WSS - 2")) {
 		snd_printk(KERN_ERR "wss: can't grab DMA2 %d\n", dma2);
-		snd_wss_free(chip);
 		return -EBUSY;
 	}
 	if (dma1 == dma2 || dma2 < 0) {
···
 	}
 
 	/* global setup */
-	if (snd_wss_probe(chip) < 0) {
-		snd_wss_free(chip);
+	if (snd_wss_probe(chip) < 0)
 		return -ENODEV;
-	}
 	snd_wss_init(chip);
 
 #if 0
···
 				   "not accessible\n");
 	}
 #endif
-
-	/* Register device */
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		snd_wss_free(chip);
-		return err;
-	}
 
 #ifdef CONFIG_PM
 	/* Power Management */