forked from luck/tmp_suning_uos_patched
ALSA: core: reduce stack usage related to snd_ctl_new()
The callers of snd_ctl_new() need to have 'struct snd_kcontrol' data, and pass the data as template. Then, the function allocates the structure data again and copy from the template. This is a waste of resources. Especially, the callers use large stack for the template. This commit removes a need of template for the function, thus, changes the prototype of snd_ctl_new(). Furthermore, this commit changes the code of callers, snd_ctl_new1() and snd_ctl_elem_add() for better shape. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
Takashi Iwai
parent
4ed56666b7
commit
2225e79b9b
|
|
@ -192,36 +192,43 @@ void snd_ctl_notify(struct snd_card *card, unsigned int mask,
|
|||
EXPORT_SYMBOL(snd_ctl_notify);
|
||||
|
||||
/**
|
||||
* snd_ctl_new - create a control instance from the template
|
||||
* @control: the control template
|
||||
* @access: the default control access
|
||||
* snd_ctl_new - create a new control instance with some elements
|
||||
* @kctl: the pointer to store new control instance
|
||||
* @count: the number of elements in this control
|
||||
* @access: the default access flags for elements in this control
|
||||
* @file: given when locking these elements
|
||||
*
|
||||
* Allocates a new struct snd_kcontrol instance and copies the given template
|
||||
* to the new instance. It does not copy volatile data (access).
|
||||
* Allocates a memory object for a new control instance. The instance has
|
||||
* elements as many as the given number (@count). Each element has given
|
||||
* access permissions (@access). Each element is locked when @file is given.
|
||||
*
|
||||
* Return: The pointer of the new instance, or %NULL on failure.
|
||||
* Return: 0 on success, error code on failure
|
||||
*/
|
||||
static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
|
||||
unsigned int access)
|
||||
static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count,
|
||||
unsigned int access, struct snd_ctl_file *file)
|
||||
{
|
||||
struct snd_kcontrol *kctl;
|
||||
unsigned int size;
|
||||
unsigned int idx;
|
||||
|
||||
if (snd_BUG_ON(!control || !control->count))
|
||||
return NULL;
|
||||
if (count == 0 || count > MAX_CONTROL_COUNT)
|
||||
return -EINVAL;
|
||||
|
||||
if (control->count > MAX_CONTROL_COUNT)
|
||||
return NULL;
|
||||
size = sizeof(struct snd_kcontrol);
|
||||
size += sizeof(struct snd_kcontrol_volatile) * count;
|
||||
|
||||
kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
|
||||
if (kctl == NULL) {
|
||||
*kctl = kzalloc(size, GFP_KERNEL);
|
||||
if (*kctl == NULL) {
|
||||
pr_err("ALSA: Cannot allocate control instance\n");
|
||||
return NULL;
|
||||
return -ENOMEM;
|
||||
}
|
||||
*kctl = *control;
|
||||
for (idx = 0; idx < kctl->count; idx++)
|
||||
kctl->vd[idx].access = access;
|
||||
return kctl;
|
||||
|
||||
for (idx = 0; idx < count; idx++) {
|
||||
(*kctl)->vd[idx].access = access;
|
||||
(*kctl)->vd[idx].owner = file;
|
||||
}
|
||||
(*kctl)->count = count;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -238,37 +245,53 @@ static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
|
|||
struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
|
||||
void *private_data)
|
||||
{
|
||||
struct snd_kcontrol kctl;
|
||||
struct snd_kcontrol *kctl;
|
||||
unsigned int count;
|
||||
unsigned int access;
|
||||
int err;
|
||||
|
||||
if (snd_BUG_ON(!ncontrol || !ncontrol->info))
|
||||
return NULL;
|
||||
memset(&kctl, 0, sizeof(kctl));
|
||||
kctl.id.iface = ncontrol->iface;
|
||||
kctl.id.device = ncontrol->device;
|
||||
kctl.id.subdevice = ncontrol->subdevice;
|
||||
|
||||
count = ncontrol->count;
|
||||
if (count == 0)
|
||||
count = 1;
|
||||
|
||||
access = ncontrol->access;
|
||||
if (access == 0)
|
||||
access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
|
||||
access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE |
|
||||
SNDRV_CTL_ELEM_ACCESS_VOLATILE |
|
||||
SNDRV_CTL_ELEM_ACCESS_INACTIVE |
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE |
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND |
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
|
||||
|
||||
err = snd_ctl_new(&kctl, count, access, NULL);
|
||||
if (err < 0)
|
||||
return NULL;
|
||||
|
||||
/* The 'numid' member is decided when calling snd_ctl_add(). */
|
||||
kctl->id.iface = ncontrol->iface;
|
||||
kctl->id.device = ncontrol->device;
|
||||
kctl->id.subdevice = ncontrol->subdevice;
|
||||
if (ncontrol->name) {
|
||||
strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
|
||||
if (strcmp(ncontrol->name, kctl.id.name) != 0)
|
||||
strlcpy(kctl->id.name, ncontrol->name, sizeof(kctl->id.name));
|
||||
if (strcmp(ncontrol->name, kctl->id.name) != 0)
|
||||
pr_warn("ALSA: Control name '%s' truncated to '%s'\n",
|
||||
ncontrol->name, kctl.id.name);
|
||||
ncontrol->name, kctl->id.name);
|
||||
}
|
||||
kctl.id.index = ncontrol->index;
|
||||
kctl.count = ncontrol->count ? ncontrol->count : 1;
|
||||
access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
|
||||
(ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
|
||||
SNDRV_CTL_ELEM_ACCESS_VOLATILE|
|
||||
SNDRV_CTL_ELEM_ACCESS_INACTIVE|
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
|
||||
kctl.info = ncontrol->info;
|
||||
kctl.get = ncontrol->get;
|
||||
kctl.put = ncontrol->put;
|
||||
kctl.tlv.p = ncontrol->tlv.p;
|
||||
kctl.private_value = ncontrol->private_value;
|
||||
kctl.private_data = private_data;
|
||||
return snd_ctl_new(&kctl, access);
|
||||
kctl->id.index = ncontrol->index;
|
||||
|
||||
kctl->info = ncontrol->info;
|
||||
kctl->get = ncontrol->get;
|
||||
kctl->put = ncontrol->put;
|
||||
kctl->tlv.p = ncontrol->tlv.p;
|
||||
|
||||
kctl->private_value = ncontrol->private_value;
|
||||
kctl->private_data = private_data;
|
||||
|
||||
return kctl;
|
||||
}
|
||||
EXPORT_SYMBOL(snd_ctl_new1);
|
||||
|
||||
|
|
@ -1179,44 +1202,48 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
|
|||
[SNDRV_CTL_ELEM_TYPE_INTEGER64] = 64,
|
||||
};
|
||||
struct snd_card *card = file->card;
|
||||
struct snd_kcontrol kctl, *_kctl;
|
||||
struct snd_kcontrol *kctl;
|
||||
unsigned int count;
|
||||
unsigned int access;
|
||||
long private_size;
|
||||
struct user_element *ue;
|
||||
int idx, err;
|
||||
|
||||
access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
|
||||
(info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
|
||||
SNDRV_CTL_ELEM_ACCESS_INACTIVE|
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
|
||||
info->id.numid = 0;
|
||||
memset(&kctl, 0, sizeof(kctl));
|
||||
int err;
|
||||
|
||||
/* Delete a control to replace them if needed. */
|
||||
if (replace) {
|
||||
info->id.numid = 0;
|
||||
err = snd_ctl_remove_user_ctl(file, &info->id);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
|
||||
if (card->user_ctl_count >= MAX_USER_CONTROLS)
|
||||
/*
|
||||
* The number of userspace controls are counted control by control,
|
||||
* not element by element.
|
||||
*/
|
||||
if (card->user_ctl_count + 1 > MAX_USER_CONTROLS)
|
||||
return -ENOMEM;
|
||||
|
||||
memcpy(&kctl.id, &info->id, sizeof(info->id));
|
||||
kctl.count = info->owner ? info->owner : 1;
|
||||
access |= SNDRV_CTL_ELEM_ACCESS_USER;
|
||||
if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
|
||||
kctl.info = snd_ctl_elem_user_enum_info;
|
||||
else
|
||||
kctl.info = snd_ctl_elem_user_info;
|
||||
if (access & SNDRV_CTL_ELEM_ACCESS_READ)
|
||||
kctl.get = snd_ctl_elem_user_get;
|
||||
if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
|
||||
kctl.put = snd_ctl_elem_user_put;
|
||||
if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
|
||||
kctl.tlv.c = snd_ctl_elem_user_tlv;
|
||||
access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
|
||||
}
|
||||
/* Check the number of elements for this userspace control. */
|
||||
count = info->owner;
|
||||
if (count == 0)
|
||||
count = 1;
|
||||
|
||||
/* Arrange access permissions if needed. */
|
||||
access = info->access;
|
||||
if (access == 0)
|
||||
access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
|
||||
access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE |
|
||||
SNDRV_CTL_ELEM_ACCESS_INACTIVE |
|
||||
SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE);
|
||||
if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)
|
||||
access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
|
||||
access |= SNDRV_CTL_ELEM_ACCESS_USER;
|
||||
|
||||
/*
|
||||
* Check information and calculate the size of data specific to
|
||||
* this userspace control.
|
||||
*/
|
||||
if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
|
||||
info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64)
|
||||
return -EINVAL;
|
||||
|
|
@ -1226,11 +1253,27 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
|
|||
if (info->count < 1 ||
|
||||
info->count > max_value_counts[info->type])
|
||||
return -EINVAL;
|
||||
|
||||
private_size = value_sizes[info->type] * info->count;
|
||||
ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
|
||||
if (ue == NULL)
|
||||
|
||||
/*
|
||||
* Keep memory object for this userspace control. After passing this
|
||||
* code block, the instance should be freed by snd_ctl_free_one().
|
||||
*
|
||||
* Note that these elements in this control are locked.
|
||||
*/
|
||||
err = snd_ctl_new(&kctl, count, access, file);
|
||||
if (err < 0)
|
||||
return err;
|
||||
kctl->private_data = kzalloc(sizeof(struct user_element) + private_size,
|
||||
GFP_KERNEL);
|
||||
if (kctl->private_data == NULL) {
|
||||
kfree(kctl);
|
||||
return -ENOMEM;
|
||||
}
|
||||
kctl->private_free = snd_ctl_elem_user_free;
|
||||
|
||||
/* Set private data for this userspace control. */
|
||||
ue = (struct user_element *)kctl->private_data;
|
||||
ue->card = card;
|
||||
ue->info = *info;
|
||||
ue->info.access = 0;
|
||||
|
|
@ -1239,21 +1282,25 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
|
|||
if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
|
||||
err = snd_ctl_elem_init_enum_names(ue);
|
||||
if (err < 0) {
|
||||
kfree(ue);
|
||||
snd_ctl_free_one(kctl);
|
||||
return err;
|
||||
}
|
||||
}
|
||||
kctl.private_free = snd_ctl_elem_user_free;
|
||||
_kctl = snd_ctl_new(&kctl, access);
|
||||
if (_kctl == NULL) {
|
||||
kfree(ue->priv_data);
|
||||
kfree(ue);
|
||||
return -ENOMEM;
|
||||
}
|
||||
_kctl->private_data = ue;
|
||||
for (idx = 0; idx < _kctl->count; idx++)
|
||||
_kctl->vd[idx].owner = file;
|
||||
err = snd_ctl_add(card, _kctl);
|
||||
|
||||
/* Set callback functions. */
|
||||
if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
|
||||
kctl->info = snd_ctl_elem_user_enum_info;
|
||||
else
|
||||
kctl->info = snd_ctl_elem_user_info;
|
||||
if (access & SNDRV_CTL_ELEM_ACCESS_READ)
|
||||
kctl->get = snd_ctl_elem_user_get;
|
||||
if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
|
||||
kctl->put = snd_ctl_elem_user_put;
|
||||
if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)
|
||||
kctl->tlv.c = snd_ctl_elem_user_tlv;
|
||||
|
||||
/* This function manage to free the instance on failure. */
|
||||
err = snd_ctl_add(card, kctl);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user