ALSA: core: Re-add snd_device_disconnect()

Revive snd_device_disconnect() again so that it can be called from the
individual driver.  This time, HD-audio will need it.

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

diff --git a/include/sound/core.h b/include/sound/core.h
index da57482..b12931f 100644 (file)
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -278,7 +278,8 @@ 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_all(struct snd_card *card);
+void snd_device_disconnect(struct snd_card *card, void *device_data);
+void snd_device_disconnect_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);
 

diff --git a/sound/core/device.c b/sound/core/device.c
index 41bec30..446dc45 100644 (file)
--- a/sound/core/device.c
+++ b/sound/core/device.c
@@ -73,7 +73,7 @@ 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)
+static void __snd_device_disconnect(struct snd_device *dev)
 {
        if (dev->state == SNDRV_DEV_REGISTERED) {
                if (dev->ops->dev_disconnect &&
@@ -81,7 +81,6 @@ static int __snd_device_disconnect(struct snd_device *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)
@@ -108,6 +107,34 @@ static struct snd_device *look_for_dev(struct snd_card *card, void *device_data)
        return NULL;
 }
 
+/**
+ * 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.
+ */
+void snd_device_disconnect(struct snd_card *card, void *device_data)
+{
+       struct snd_device *dev;
+
+       if (snd_BUG_ON(!card || !device_data))
+               return;
+       dev = look_for_dev(card, device_data);
+       if (dev)
+               __snd_device_disconnect(dev);
+       else
+               dev_dbg(card->dev, "device disconnect %p (from %pF), not found\n",
+                       device_data, __builtin_return_address(0));
+}
+EXPORT_SYMBOL_GPL(snd_device_disconnect);
+
 /**
  * snd_device_free - release the device from the card
  * @card: the card instance
@@ -195,18 +222,14 @@ int snd_device_register_all(struct snd_card *card)
  * disconnect all the devices on the card.
  * called from init.c
  */
-int snd_device_disconnect_all(struct snd_card *card)
+void snd_device_disconnect_all(struct snd_card *card)
 {
        struct snd_device *dev;
-       int err = 0;
 
        if (snd_BUG_ON(!card))
-               return -ENXIO;
-       list_for_each_entry_reverse(dev, &card->devices, list) {
-               if (__snd_device_disconnect(dev) < 0)
-                       err = -ENXIO;
-       }
-       return err;
+               return;
+       list_for_each_entry_reverse(dev, &card->devices, list)
+               __snd_device_disconnect(dev);
 }
 
 /*

diff --git a/sound/core/init.c b/sound/core/init.c
index 3541905..04734e0 100644 (file)
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -400,7 +400,6 @@ static const struct file_operations snd_shutdown_f_ops =
 int snd_card_disconnect(struct snd_card *card)
 {
        struct snd_monitor_file *mfile;
-       int err;
 
        if (!card)
                return -EINVAL;
@@ -445,9 +444,7 @@ int snd_card_disconnect(struct snd_card *card)
 #endif
 
        /* notify all devices that we are disconnected */
-       err = snd_device_disconnect_all(card);
-       if (err < 0)
-               dev_err(card->dev, "not all devices for card %i can be disconnected\n", card->number);
+       snd_device_disconnect_all(card);
 
        snd_info_card_disconnect(card);
        if (card->registered) {