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-rw-r--r--sound/core/control.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index be5b97cd8dc3..196a6fe100ca 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1029,7 +1029,7 @@ static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
struct user_element {
struct snd_ctl_elem_info info;
struct snd_card *card;
- void *elem_data; /* element data */
+ char *elem_data; /* element data */
unsigned long elem_data_size; /* size of element data in bytes */
void *tlv_data; /* TLV data */
unsigned long tlv_data_size; /* TLV data size */
@@ -1078,9 +1078,12 @@ static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct user_element *ue = kcontrol->private_data;
+ unsigned int size = ue->elem_data_size;
+ char *src = ue->elem_data +
+ snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size;
mutex_lock(&ue->card->user_ctl_lock);
- memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
+ memcpy(&ucontrol->value, src, size);
mutex_unlock(&ue->card->user_ctl_lock);
return 0;
}
@@ -1090,11 +1093,14 @@ static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
{
int change;
struct user_element *ue = kcontrol->private_data;
+ unsigned int size = ue->elem_data_size;
+ char *dst = ue->elem_data +
+ snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size;
mutex_lock(&ue->card->user_ctl_lock);
- change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
+ change = memcmp(&ucontrol->value, dst, size) != 0;
if (change)
- memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
+ memcpy(dst, &ucontrol->value, size);
mutex_unlock(&ue->card->user_ctl_lock);
return change;
}
@@ -1278,7 +1284,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
if (err < 0)
return err;
memcpy(&kctl->id, &info->id, sizeof(kctl->id));
- kctl->private_data = kzalloc(sizeof(struct user_element) + private_size,
+ kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count,
GFP_KERNEL);
if (kctl->private_data == NULL) {
kfree(kctl);