ALSA: Clean up snd_device_*() codes

A few code cleanups and optimizations.  In addition, drop
snd_device_disconnect() that isn't used at all, and drop the return
values from snd_device_free*().

Another slight difference by this change is that now the device state
will become always SNDRV_DEV_REGISTERED no matter whether dev_register
ops is present or not.  It's for better consistency.  There should be
no impact for the current tree, as the state isn't checked.

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

diff --git a/include/sound/core.h b/include/sound/core.h
index f1e41f4..aac9a85 100644 (file)
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -309,10 +309,9 @@ int snd_device_new(struct snd_card *card, enum snd_device_type type,
                   void *device_data, struct snd_device_ops *ops);
 int snd_device_register(struct snd_card *card, void *device_data);
 int snd_device_register_all(struct snd_card *card);
-int snd_device_disconnect(struct snd_card *card, void *device_data);
 int snd_device_disconnect_all(struct snd_card *card);
-int snd_device_free(struct snd_card *card, void *device_data);
-int snd_device_free_all(struct snd_card *card);
+void snd_device_free(struct snd_card *card, void *device_data);
+void snd_device_free_all(struct snd_card *card);
 
 /* isadma.c */
 

diff --git a/sound/core/device.c b/sound/core/device.c
index 53291ff..41bec30 100644 (file)
--- a/sound/core/device.c
+++ b/sound/core/device.c
@@ -73,6 +73,30 @@ int snd_device_new(struct snd_card *card, enum snd_device_type type,
 }
 EXPORT_SYMBOL(snd_device_new);
 
+static int __snd_device_disconnect(struct snd_device *dev)
+{
+       if (dev->state == SNDRV_DEV_REGISTERED) {
+               if (dev->ops->dev_disconnect &&
+                   dev->ops->dev_disconnect(dev))
+                       dev_err(dev->card->dev, "device disconnect failure\n");
+               dev->state = SNDRV_DEV_DISCONNECTED;
+       }
+       return 0;
+}
+
+static void __snd_device_free(struct snd_device *dev)
+{
+       /* unlink */
+       list_del(&dev->list);
+
+       __snd_device_disconnect(dev);
+       if (dev->ops->dev_free) {
+               if (dev->ops->dev_free(dev))
+                       dev_err(dev->card->dev, "device free failure\n");
+       }
+       kfree(dev);
+}
+
 static struct snd_device *look_for_dev(struct snd_card *card, void *device_data)
 {
        struct snd_device *dev;
@@ -92,71 +116,33 @@ static struct snd_device *look_for_dev(struct snd_card *card, void *device_data)
  * Removes the device from the list on the card and invokes the
  * callbacks, dev_disconnect and dev_free, corresponding to the state.
  * Then release the device.
- *
- * Return: Zero if successful, or a negative error code on failure or if the
- * device not found.
  */
-int snd_device_free(struct snd_card *card, void *device_data)
+void snd_device_free(struct snd_card *card, void *device_data)
 {
        struct snd_device *dev;
        
        if (snd_BUG_ON(!card || !device_data))
-               return -ENXIO;
+               return;
        dev = look_for_dev(card, device_data);
-       if (dev) {
-               /* unlink */
-               list_del(&dev->list);
-               if (dev->state == SNDRV_DEV_REGISTERED &&
-                   dev->ops->dev_disconnect)
-                       if (dev->ops->dev_disconnect(dev))
-                               dev_err(card->dev,
-                                       "device disconnect failure\n");
-               if (dev->ops->dev_free) {
-                       if (dev->ops->dev_free(dev))
-                               dev_err(card->dev, "device free failure\n");
-               }
-               kfree(dev);
-               return 0;
-       }
-       dev_dbg(card->dev, "device free %p (from %pF), not found\n",
-               device_data, __builtin_return_address(0));
-       return -ENXIO;
+       if (dev)
+               __snd_device_free(dev);
+       else
+               dev_dbg(card->dev, "device free %p (from %pF), not found\n",
+                       device_data, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(snd_device_free);
 
-/**
- * snd_device_disconnect - disconnect the device
- * @card: the card instance
- * @device_data: the data pointer to disconnect
- *
- * Turns the device into the disconnection state, invoking
- * dev_disconnect callback, if the device was already registered.
- *
- * Usually called from snd_card_disconnect().
- *
- * Return: Zero if successful, or a negative error code on failure or if the
- * device not found.
- */
-int snd_device_disconnect(struct snd_card *card, void *device_data)
+static int __snd_device_register(struct snd_device *dev)
 {
-       struct snd_device *dev;
-
-       if (snd_BUG_ON(!card || !device_data))
-               return -ENXIO;
-       dev = look_for_dev(card, device_data);
-       if (dev) {
-               if (dev->state == SNDRV_DEV_REGISTERED &&
-                   dev->ops->dev_disconnect) {
-                       if (dev->ops->dev_disconnect(dev))
-                               dev_err(card->dev,
-                                       "device disconnect failure\n");
-                       dev->state = SNDRV_DEV_DISCONNECTED;
+       if (dev->state == SNDRV_DEV_BUILD) {
+               if (dev->ops->dev_register) {
+                       int err = dev->ops->dev_register(dev);
+                       if (err < 0)
+                               return err;
                }
-               return 0;
+               dev->state = SNDRV_DEV_REGISTERED;
        }
-       dev_dbg(card->dev, "device disconnect %p (from %pF), not found\n",
-               device_data, __builtin_return_address(0));
-       return -ENXIO;
+       return 0;
 }
 
 /**
@@ -175,21 +161,12 @@ int snd_device_disconnect(struct snd_card *card, void *device_data)
 int snd_device_register(struct snd_card *card, void *device_data)
 {
        struct snd_device *dev;
-       int err;
 
        if (snd_BUG_ON(!card || !device_data))
                return -ENXIO;
        dev = look_for_dev(card, device_data);
-       if (dev) {
-               if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
-                       if ((err = dev->ops->dev_register(dev)) < 0)
-                               return err;
-                       dev->state = SNDRV_DEV_REGISTERED;
-                       return 0;
-               }
-               dev_dbg(card->dev, "snd_device_register busy\n");
-               return -EBUSY;
-       }
+       if (dev)
+               return __snd_device_register(dev);
        snd_BUG();
        return -ENXIO;
 }
@@ -207,11 +184,9 @@ int snd_device_register_all(struct snd_card *card)
        if (snd_BUG_ON(!card))
                return -ENXIO;
        list_for_each_entry(dev, &card->devices, list) {
-               if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
-                       if ((err = dev->ops->dev_register(dev)) < 0)
-                               return err;
-                       dev->state = SNDRV_DEV_REGISTERED;
-               }
+               err = __snd_device_register(dev);
+               if (err < 0)
+                       return err;
        }
        return 0;
 }
@@ -228,7 +203,7 @@ int snd_device_disconnect_all(struct snd_card *card)
        if (snd_BUG_ON(!card))
                return -ENXIO;
        list_for_each_entry_reverse(dev, &card->devices, list) {
-               if (snd_device_disconnect(card, dev->device_data) < 0)
+               if (__snd_device_disconnect(dev) < 0)
                        err = -ENXIO;
        }
        return err;
@@ -238,17 +213,12 @@ int snd_device_disconnect_all(struct snd_card *card)
  * release all the devices on the card.
  * called from init.c
  */
-int snd_device_free_all(struct snd_card *card)
+void snd_device_free_all(struct snd_card *card)
 {
        struct snd_device *dev, *next;
-       int ret = 0;
 
        if (snd_BUG_ON(!card))
-               return -ENXIO;
-       list_for_each_entry_safe_reverse(dev, next, &card->devices, list) {
-               int err = snd_device_free(card, dev->device_data);
-               if (err < 0)
-                       ret = err;
-       }
-       return ret;
+               return;
+       list_for_each_entry_safe_reverse(dev, next, &card->devices, list)
+               __snd_device_free(dev);
 }

diff --git a/sound/core/init.c b/sound/core/init.c
index 9e7f17b..5ee8384 100644 (file)
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -454,10 +454,7 @@ static int snd_card_do_free(struct snd_card *card)
        if (snd_mixer_oss_notify_callback)
                snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
 #endif
-       if (snd_device_free_all(card) < 0) {
-               dev_err(card->dev, "unable to free all devices\n");
-               /* Fatal, but this situation should never occur */
-       }
+       snd_device_free_all(card);
        if (card->private_free)
                card->private_free(card);
        snd_info_free_entry(card->proc_id);