ALSA: sscape: Allocate resources with device-managed APIs

This patch converts the resource management in ISA sscape driver with
devres as a clean up. Each manual resource management is converted
with the corresponding devres helper. The remove callback became
superfluous and dropped.

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/sscape.c

···
 }
 
 /*
- * Do the necessary ALSA-level cleanup to deallocate our driver ...
- */
-static void soundscape_free(struct snd_card *c)
-{
-	struct soundscape *sscape = get_card_soundscape(c);
-	release_and_free_resource(sscape->io_res);
-	release_and_free_resource(sscape->wss_res);
-	free_dma(sscape->chip->dma1);
-}
-
-/*
  * Tell the SoundScape to begin a DMA transfer using the given channel.
  * All locking issues are left to the caller.
  */
···
 	 * Grab IO ports that we will need to probe so that we
 	 * can detect and control this hardware ...
 	 */
-	io_res = request_region(port[dev], 8, "SoundScape");
+	io_res = devm_request_region(card->dev, port[dev], 8, "SoundScape");
 	if (!io_res) {
 		snd_printk(KERN_ERR
 			   "sscape: can't grab port 0x%lx\n", port[dev]);
···
 	}
 	wss_res = NULL;
 	if (sscape->type == SSCAPE_VIVO) {
-		wss_res = request_region(wss_port[dev], 4, "SoundScape");
+		wss_res = devm_request_region(card->dev, wss_port[dev], 4,
+					      "SoundScape");
 		if (!wss_res) {
 			snd_printk(KERN_ERR "sscape: can't grab port 0x%lx\n",
 					    wss_port[dev]);
-			err = -EBUSY;
-			goto _release_region;
+			return -EBUSY;
 		}
 	}
 
 	/*
 	 * Grab one DMA channel ...
 	 */
-	err = request_dma(dma[dev], "SoundScape");
+	err = snd_devm_request_dma(card->dev, dma[dev], "SoundScape");
 	if (err < 0) {
 		snd_printk(KERN_ERR "sscape: can't grab DMA %d\n", dma[dev]);
-		goto _release_region;
+		return err;
 	}
 
 	spin_lock_init(&sscape->lock);
···
 	if (!detect_sscape(sscape, wss_port[dev])) {
 		printk(KERN_ERR "sscape: hardware not detected at 0x%x\n",
 			sscape->io_base);
-		err = -ENODEV;
-		goto _release_dma;
+		return -ENODEV;
 	}
 
 	switch (sscape->type) {
···
 	irq_cfg = get_irq_config(sscape->type, irq[dev]);
 	if (irq_cfg == INVALID_IRQ) {
 		snd_printk(KERN_ERR "sscape: Invalid IRQ %d\n", irq[dev]);
-		err = -ENXIO;
-		goto _release_dma;
+		return -ENXIO;
 	}
 
 	mpu_irq_cfg = get_irq_config(sscape->type, mpu_irq[dev]);
 	if (mpu_irq_cfg == INVALID_IRQ) {
 		snd_printk(KERN_ERR "sscape: Invalid IRQ %d\n", mpu_irq[dev]);
-		err = -ENXIO;
-		goto _release_dma;
+		return -ENXIO;
 	}
 
 	/*
···
 		snd_printk(KERN_ERR
 				"sscape: No AD1845 device at 0x%lx, IRQ %d\n",
 				wss_port[dev], irq[dev]);
-		goto _release_dma;
+		return err;
 	}
 	strcpy(card->driver, "SoundScape");
 	strcpy(card->shortname, name);
···
 				snd_printk(KERN_ERR "sscape: Failed to create "
 						"MPU-401 device at 0x%lx\n",
 						port[dev]);
-				goto _release_dma;
+				return err;
 			}
 
 			/*
···
 		}
 	}
 
-	/*
-	 * Now that we have successfully created this sound card,
-	 * it is safe to store the pointer.
-	 * NOTE: we only register the sound card's "destructor"
-	 *       function now that our "constructor" has completed.
-	 */
-	card->private_free = soundscape_free;
-
 	return 0;
-
-_release_dma:
-	free_dma(dma[dev]);
-
-_release_region:
-	release_and_free_resource(wss_res);
-	release_and_free_resource(io_res);
-
-	return err;
 }
 
 
···
 	struct soundscape *sscape;
 	int ret;
 
-	ret = snd_card_new(pdev, index[dev], id[dev], THIS_MODULE,
-			   sizeof(struct soundscape), &card);
+	ret = snd_devm_card_new(pdev, index[dev], id[dev], THIS_MODULE,
+				sizeof(struct soundscape), &card);
 	if (ret < 0)
 		return ret;
 
···
 
 	ret = create_sscape(dev, card);
 	if (ret < 0)
-		goto _release_card;
+		return ret;
 
 	ret = snd_card_register(card);
 	if (ret < 0) {
 		snd_printk(KERN_ERR "sscape: Failed to register sound card\n");
-		goto _release_card;
+		return ret;
 	}
 	dev_set_drvdata(pdev, card);
 	return 0;
-
-_release_card:
-	snd_card_free(card);
-	return ret;
-}
-
-static void snd_sscape_remove(struct device *devptr, unsigned int dev)
-{
-	snd_card_free(dev_get_drvdata(devptr));
 }
 
 #define DEV_NAME "sscape"
···
 static struct isa_driver snd_sscape_driver = {
 	.match		= snd_sscape_match,
 	.probe		= snd_sscape_probe,
-	.remove		= snd_sscape_remove,
 	/* FIXME: suspend/resume */
 	.driver		= {
 		.name	= DEV_NAME
···
 	 * Create a new ALSA sound card entry, in anticipation
 	 * of detecting our hardware ...
 	 */
-	ret = snd_card_new(&pcard->card->dev,
-			   index[idx], id[idx], THIS_MODULE,
-			   sizeof(struct soundscape), &card);
+	ret = snd_devm_card_new(&pcard->card->dev,
+				index[idx], id[idx], THIS_MODULE,
+				sizeof(struct soundscape), &card);
 	if (ret < 0)
 		return ret;
 
···
 
 	ret = create_sscape(idx, card);
 	if (ret < 0)
-		goto _release_card;
+		return ret;
 
 	ret = snd_card_register(card);
 	if (ret < 0) {
 		snd_printk(KERN_ERR "sscape: Failed to register sound card\n");
-		goto _release_card;
+		return ret;
 	}
 
 	pnp_set_card_drvdata(pcard, card);
 	++idx;
 	return 0;
-
-_release_card:
-	snd_card_free(card);
-	return ret;
-}
-
-static void sscape_pnp_remove(struct pnp_card_link *pcard)
-{
-	snd_card_free(pnp_get_card_drvdata(pcard));
-	pnp_set_card_drvdata(pcard, NULL);
 }
 
 static struct pnp_card_driver sscape_pnpc_driver = {
···
 	.name = "sscape",
 	.id_table = sscape_pnpids,
 	.probe = sscape_pnp_detect,
-	.remove = sscape_pnp_remove,
 };
 
 #endif /* CONFIG_PNP */