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authorTakashi Sakamoto2015-04-12 10:12:25 +0900
committerTakashi Iwai2015-04-13 10:31:49 +0200
commite1c78df1da112f2644058af2425dd5ca3eb1a96a (patch)
treeab5df7d5a9e38ec5054820575a84a4dd6e5d35f4 /sound
parent9a4f35865ffcb2f4603375eadabe0d475fab1a0f (diff)
ALSA: ctl: fix to handle several elements added by one operation for userspace element
An element instance can have several elements with the same feature. Some userspace applications can add such an element instance by add operation with the number of elements. Then, the element instance gets a memory object to keep states of these elements. But the element instance has just one memory object for the elements. This causes the same result to each read/write operations to the different elements. This commit fixes this bug by allocating enough memory objects to the element instance for each of elements. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-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);