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authorTakashi Iwai <tiwai@suse.de>2011-11-10 12:34:24 +0100
committerTakashi Iwai <tiwai@suse.de>2011-11-10 12:34:24 +0100
commit9e226b4b7e77215ca70461edc33800f6c1ba63d3 (patch)
tree386ce06a62a0ad58240fed3e8e023848c6a26925
parentaeb4b88ec0a948efce8e3a23a8f964d3560a7308 (diff)
ALSA: vmaster - Free slave-links when freeing the master element
When freeing the vmaster master element, we should release slave-links properly, not only assumig that slaves will be freed soon later. Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/core/vmaster.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c
index 5dbab38d04af..130cfe677d60 100644
--- a/sound/core/vmaster.c
+++ b/sound/core/vmaster.c
@@ -52,6 +52,7 @@ struct link_slave {
struct link_ctl_info info;
int vals[2]; /* current values */
unsigned int flags;
+ struct snd_kcontrol *kctl; /* original kcontrol pointer */
struct snd_kcontrol slave; /* the copy of original control entry */
};
@@ -252,6 +253,7 @@ int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
slave->count * sizeof(*slave->vd), GFP_KERNEL);
if (!srec)
return -ENOMEM;
+ srec->kctl = slave;
srec->slave = *slave;
memcpy(srec->slave.vd, slave->vd, slave->count * sizeof(*slave->vd));
srec->master = master_link;
@@ -333,10 +335,18 @@ static int master_put(struct snd_kcontrol *kcontrol,
static void master_free(struct snd_kcontrol *kcontrol)
{
struct link_master *master = snd_kcontrol_chip(kcontrol);
- struct link_slave *slave;
-
- list_for_each_entry(slave, &master->slaves, list)
- slave->master = NULL;
+ struct link_slave *slave, *n;
+
+ /* free all slave links and retore the original slave kctls */
+ list_for_each_entry_safe(slave, n, &master->slaves, list) {
+ struct snd_kcontrol *sctl = slave->kctl;
+ struct list_head olist = sctl->list;
+ memcpy(sctl, &slave->slave, sizeof(*sctl));
+ memcpy(sctl->vd, slave->slave.vd,
+ sctl->count * sizeof(*sctl->vd));
+ sctl->list = olist; /* keep the current linked-list */
+ kfree(slave);
+ }
kfree(master);
}