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authorTakashi Iwai <tiwai@suse.de>2019-01-10 20:44:58 +0100
committerTakashi Iwai <tiwai@suse.de>2019-01-11 08:35:14 +0100
commiteffbc3c1d250665b1ca61ec4e3f62e5a1ae9e2bb (patch)
tree31d5bc4a428e638e88ca00ce6572d42ea93eefb3
parent8cc1f35befcbb1d850d6a79dbc8beb3e6636d2e4 (diff)
ALSA: control: Consolidate helpers for adding and replacing
ctl elements (bsc#1121278). suse-commit: 63899f84e2b7f050abed3d2769e1661622999677
-rw-r--r--sound/core/control.c123
1 files changed, 52 insertions, 71 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index 24888ef1ae1d..f0f69aa2f26e 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -347,22 +347,41 @@ static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
return 0;
}
-/* add a new kcontrol object; call with card->controls_rwsem locked */
-static int __snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
+enum snd_ctl_add_mode {
+ CTL_ADD_EXCLUSIVE, CTL_REPLACE, CTL_ADD_ON_REPLACE,
+};
+
+/* add/replace a new kcontrol object; call with card->controls_rwsem locked */
+static int __snd_ctl_add_replace(struct snd_card *card,
+ struct snd_kcontrol *kcontrol,
+ enum snd_ctl_add_mode mode)
{
struct snd_ctl_elem_id id;
unsigned int idx;
unsigned int count;
+ struct snd_kcontrol *old;
+ int err;
id = kcontrol->id;
if (id.index > UINT_MAX - kcontrol->count)
return -EINVAL;
- if (snd_ctl_find_id(card, &id)) {
- dev_err(card->dev,
- "control %i:%i:%i:%s:%i is already present\n",
- id.iface, id.device, id.subdevice, id.name, id.index);
- return -EBUSY;
+ old = snd_ctl_find_id(card, &id);
+ if (!old) {
+ if (mode == CTL_REPLACE)
+ return -EINVAL;
+ } else {
+ if (mode == CTL_ADD_EXCLUSIVE) {
+ dev_err(card->dev,
+ "control %i:%i:%i:%s:%i is already present\n",
+ id.iface, id.device, id.subdevice, id.name,
+ id.index);
+ return -EBUSY;
+ }
+
+ err = snd_ctl_remove(card, old);
+ if (err < 0)
+ return err;
}
if (snd_ctl_find_hole(card, kcontrol->count) < 0)
@@ -381,21 +400,9 @@ static int __snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
return 0;
}
-/**
- * snd_ctl_add - add the control instance to the card
- * @card: the card instance
- * @kcontrol: the control instance to add
- *
- * Adds the control instance created via snd_ctl_new() or
- * snd_ctl_new1() to the given card. Assigns also an unique
- * numid used for fast search.
- *
- * It frees automatically the control which cannot be added.
- *
- * Return: Zero if successful, or a negative error code on failure.
- *
- */
-int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
+static int snd_ctl_add_replace(struct snd_card *card,
+ struct snd_kcontrol *kcontrol,
+ enum snd_ctl_add_mode mode)
{
int err = -EINVAL;
@@ -405,7 +412,7 @@ int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
goto error;
down_write(&card->controls_rwsem);
- err = __snd_ctl_add(card, kcontrol);
+ err = __snd_ctl_add_replace(card, kcontrol, mode);
up_write(&card->controls_rwsem);
if (err < 0)
goto error;
@@ -415,6 +422,25 @@ int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
snd_ctl_free_one(kcontrol);
return err;
}
+
+/**
+ * snd_ctl_add - add the control instance to the card
+ * @card: the card instance
+ * @kcontrol: the control instance to add
+ *
+ * Adds the control instance created via snd_ctl_new() or
+ * snd_ctl_new1() to the given card. Assigns also an unique
+ * numid used for fast search.
+ *
+ * It frees automatically the control which cannot be added.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ *
+ */
+int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
+{
+ return snd_ctl_add_replace(card, kcontrol, CTL_ADD_EXCLUSIVE);
+}
EXPORT_SYMBOL(snd_ctl_add);
/**
@@ -434,53 +460,8 @@ EXPORT_SYMBOL(snd_ctl_add);
int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
bool add_on_replace)
{
- struct snd_ctl_elem_id id;
- unsigned int count;
- unsigned int idx;
- struct snd_kcontrol *old;
- int ret;
-
- if (!kcontrol)
- return -EINVAL;
- if (snd_BUG_ON(!card || !kcontrol->info)) {
- ret = -EINVAL;
- goto error;
- }
- id = kcontrol->id;
- down_write(&card->controls_rwsem);
- old = snd_ctl_find_id(card, &id);
- if (!old) {
- if (add_on_replace)
- goto add;
- up_write(&card->controls_rwsem);
- ret = -EINVAL;
- goto error;
- }
- ret = snd_ctl_remove(card, old);
- if (ret < 0) {
- up_write(&card->controls_rwsem);
- goto error;
- }
-add:
- if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
- up_write(&card->controls_rwsem);
- ret = -ENOMEM;
- goto error;
- }
- list_add_tail(&kcontrol->list, &card->controls);
- card->controls_count += kcontrol->count;
- kcontrol->id.numid = card->last_numid + 1;
- card->last_numid += kcontrol->count;
- id = kcontrol->id;
- count = kcontrol->count;
- up_write(&card->controls_rwsem);
- for (idx = 0; idx < count; idx++, id.index++, id.numid++)
- snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
- return 0;
-
-error:
- snd_ctl_free_one(kcontrol);
- return ret;
+ return snd_ctl_add_replace(card, kcontrol,
+ add_on_replace ? CTL_ADD_ON_REPLACE : CTL_REPLACE);
}
EXPORT_SYMBOL(snd_ctl_replace);
@@ -1368,7 +1349,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
/* This function manage to free the instance on failure. */
down_write(&card->controls_rwsem);
- err = __snd_ctl_add(card, kctl);
+ err = __snd_ctl_add_replace(card, kctl, CTL_ADD_EXCLUSIVE);
if (err < 0) {
snd_ctl_free_one(kctl);
goto unlock;