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/20210715075941.23332-71-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/isa/sscape.c b/sound/isa/sscape.c
index e70ef9a..0bc0025 100644 (file)
--- a/sound/isa/sscape.c
+++ b/sound/isa/sscape.c
@@ -328,17 +328,6 @@ static void activate_ad1845_unsafe(unsigned io_base)
 }
 
 /*
- * 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.
  */
@@ -941,7 +930,7 @@ static int create_sscape(int dev, struct snd_card *card)
         * 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]);
@@ -949,22 +938,22 @@ static int create_sscape(int dev, struct snd_card *card)
        }
        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);
@@ -975,8 +964,7 @@ static int create_sscape(int dev, struct snd_card *card)
        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) {
@@ -1006,15 +994,13 @@ static int create_sscape(int dev, struct snd_card *card)
        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;
        }
 
        /*
@@ -1060,7 +1046,7 @@ static int create_sscape(int dev, struct snd_card *card)
                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);
@@ -1082,7 +1068,7 @@ static int create_sscape(int dev, struct snd_card *card)
                                snd_printk(KERN_ERR "sscape: Failed to create "
                                                "MPU-401 device at 0x%lx\n",
                                                port[dev]);
-                               goto _release_dma;
+                               return err;
                        }
 
                        /*
@@ -1109,24 +1095,7 @@ static int create_sscape(int dev, struct snd_card *card)
                }
        }
 
-       /*
-        * 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;
 }
 
 
@@ -1156,8 +1125,8 @@ static int snd_sscape_probe(struct device *pdev, unsigned int dev)
        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;
 
@@ -1168,24 +1137,15 @@ static int snd_sscape_probe(struct device *pdev, unsigned int dev)
 
        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"
@@ -1193,7 +1153,6 @@ static void snd_sscape_remove(struct device *devptr, unsigned int dev)
 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
@@ -1244,9 +1203,9 @@ static int sscape_pnp_detect(struct pnp_card_link *pcard,
         * 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;
 
@@ -1277,27 +1236,17 @@ static int sscape_pnp_detect(struct pnp_card_link *pcard,
 
        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 = {
@@ -1305,7 +1254,6 @@ 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 */