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authorTakashi Iwai <tiwai@suse.de>2014-01-29 18:53:35 +0400
committerTakashi Iwai <tiwai@suse.de>2014-02-25 15:12:51 +0400
commit289ca025ee1d78223e3368801fc2b984e5efbfc7 (patch)
tree0fbd1be93a83c459e7c053d4959fe149ec3f1785 /sound/core/device.c
parent71e2e1c147e653ee4e861b8b5dc0ae5c394870d2 (diff)
downloadlinux-289ca025ee1d78223e3368801fc2b984e5efbfc7.tar.xz
ALSA: Use priority list for managing device list
Basically, the device type specifies the priority of the device to be registered / freed, too. However, the priority value isn't well utilized but only it's checked as a group. This results in inconsistent register and free order (where each of them should be in reversed direction). This patch simplifies the device list management code by simply inserting a list entry at creation time in an incremental order for the priority value. Since we can just follow the link for register, disconnect and free calls, we don't have to specify the group; so the whole enum definitions are also simplified as well. The visible change to outside is that the priorities of some object types are revisited. For example, now the SNDRV_DEV_LOWLEVEL object is registered before others (control, PCM, etc) and, in return, released after others. Similarly, SNDRV_DEV_CODEC is in a lower priority than SNDRV_DEV_BUS for ensuring the dependency. Also, the unused SNDRV_DEV_TOPLEVEL, SNDRV_DEV_LOWLEVEL_PRE and SNDRV_DEV_LOWLEVEL_NORMAL are removed as a cleanup. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/device.c')
-rw-r--r--sound/core/device.c66
1 files changed, 37 insertions, 29 deletions
diff --git a/sound/core/device.c b/sound/core/device.c
index 856bfdc79cee..53291ff21a09 100644
--- a/sound/core/device.c
+++ b/sound/core/device.c
@@ -45,6 +45,7 @@ int snd_device_new(struct snd_card *card, enum snd_device_type type,
void *device_data, struct snd_device_ops *ops)
{
struct snd_device *dev;
+ struct list_head *p;
if (snd_BUG_ON(!card || !device_data || !ops))
return -ENXIO;
@@ -53,17 +54,36 @@ int snd_device_new(struct snd_card *card, enum snd_device_type type,
dev_err(card->dev, "Cannot allocate device, type=%d\n", type);
return -ENOMEM;
}
+ INIT_LIST_HEAD(&dev->list);
dev->card = card;
dev->type = type;
dev->state = SNDRV_DEV_BUILD;
dev->device_data = device_data;
dev->ops = ops;
- list_add(&dev->list, &card->devices); /* add to the head of list */
+
+ /* insert the entry in an incrementally sorted list */
+ list_for_each_prev(p, &card->devices) {
+ struct snd_device *pdev = list_entry(p, struct snd_device, list);
+ if ((unsigned int)pdev->type <= (unsigned int)type)
+ break;
+ }
+
+ list_add(&dev->list, p);
return 0;
}
-
EXPORT_SYMBOL(snd_device_new);
+static struct snd_device *look_for_dev(struct snd_card *card, void *device_data)
+{
+ struct snd_device *dev;
+
+ list_for_each_entry(dev, &card->devices, list)
+ if (dev->device_data == device_data)
+ return dev;
+
+ return NULL;
+}
+
/**
* snd_device_free - release the device from the card
* @card: the card instance
@@ -82,9 +102,8 @@ int snd_device_free(struct snd_card *card, void *device_data)
if (snd_BUG_ON(!card || !device_data))
return -ENXIO;
- list_for_each_entry(dev, &card->devices, list) {
- if (dev->device_data != device_data)
- continue;
+ dev = look_for_dev(card, device_data);
+ if (dev) {
/* unlink */
list_del(&dev->list);
if (dev->state == SNDRV_DEV_REGISTERED &&
@@ -103,7 +122,6 @@ int snd_device_free(struct snd_card *card, void *device_data)
device_data, __builtin_return_address(0));
return -ENXIO;
}
-
EXPORT_SYMBOL(snd_device_free);
/**
@@ -125,9 +143,8 @@ int snd_device_disconnect(struct snd_card *card, void *device_data)
if (snd_BUG_ON(!card || !device_data))
return -ENXIO;
- list_for_each_entry(dev, &card->devices, list) {
- if (dev->device_data != device_data)
- continue;
+ 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))
@@ -162,9 +179,8 @@ int snd_device_register(struct snd_card *card, void *device_data)
if (snd_BUG_ON(!card || !device_data))
return -ENXIO;
- list_for_each_entry(dev, &card->devices, list) {
- if (dev->device_data != device_data)
- continue;
+ 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;
@@ -177,7 +193,6 @@ int snd_device_register(struct snd_card *card, void *device_data)
snd_BUG();
return -ENXIO;
}
-
EXPORT_SYMBOL(snd_device_register);
/*
@@ -212,7 +227,7 @@ int snd_device_disconnect_all(struct snd_card *card)
if (snd_BUG_ON(!card))
return -ENXIO;
- list_for_each_entry(dev, &card->devices, list) {
+ list_for_each_entry_reverse(dev, &card->devices, list) {
if (snd_device_disconnect(card, dev->device_data) < 0)
err = -ENXIO;
}
@@ -223,24 +238,17 @@ 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, enum snd_device_cmd cmd)
+int snd_device_free_all(struct snd_card *card)
{
- struct snd_device *dev;
- int err;
- unsigned int range_low, range_high, type;
+ struct snd_device *dev, *next;
+ int ret = 0;
if (snd_BUG_ON(!card))
return -ENXIO;
- range_low = (unsigned int)cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
- range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
- __again:
- list_for_each_entry(dev, &card->devices, list) {
- type = (unsigned int)dev->type;
- if (type >= range_low && type <= range_high) {
- if ((err = snd_device_free(card, dev->device_data)) < 0)
- return err;
- goto __again;
- }
+ 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 0;
+ return ret;
}