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authorTakashi Iwai <tiwai@suse.de>2018-11-24 20:03:54 +0100
committerTakashi Iwai <tiwai@suse.de>2018-11-24 20:03:59 +0100
commit5f2ad5942f6b682efe2e35aff58f82568ab8c929 (patch)
tree44f5a2a287182587e816631056fbaa473cb36d66 /sound/core
parenta8c0d13267a4151b2ff124cde6331ec28ed0d55e (diff)
parente1a7bfe3807974e66f971f2589d4e0197ec0fced (diff)
Merge branch 'for-linus' into for-next
Pull the user control race fix, so that we can continue working on the code refactoring. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/control.c80
1 files changed, 45 insertions, 35 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index 9aa15bfc7936..649d3217590e 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -348,6 +348,40 @@ 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)
+{
+ struct snd_ctl_elem_id id;
+ unsigned int idx;
+ unsigned int count;
+
+ 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;
+ }
+
+ if (snd_ctl_find_hole(card, kcontrol->count) < 0)
+ return -ENOMEM;
+
+ 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;
+ for (idx = 0; idx < count; idx++, id.index++, id.numid++)
+ snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
+
+ return 0;
+}
+
/**
* snd_ctl_add - add the control instance to the card
* @card: the card instance
@@ -364,45 +398,18 @@ static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
*/
int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
{
- struct snd_ctl_elem_id id;
- unsigned int idx;
- unsigned int count;
int err = -EINVAL;
if (! kcontrol)
return err;
if (snd_BUG_ON(!card || !kcontrol->info))
goto error;
- id = kcontrol->id;
- if (id.index > UINT_MAX - kcontrol->count)
- goto error;
down_write(&card->controls_rwsem);
- if (snd_ctl_find_id(card, &id)) {
- up_write(&card->controls_rwsem);
- dev_err(card->dev, "control %i:%i:%i:%s:%i is already present\n",
- id.iface,
- id.device,
- id.subdevice,
- id.name,
- id.index);
- err = -EBUSY;
- goto error;
- }
- if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
- up_write(&card->controls_rwsem);
- err = -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;
+ err = __snd_ctl_add(card, kcontrol);
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);
+ if (err < 0)
+ goto error;
return 0;
error:
@@ -1361,9 +1368,12 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
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;
+ down_write(&card->controls_rwsem);
+ err = __snd_ctl_add(card, kctl);
+ if (err < 0) {
+ snd_ctl_free_one(kctl);
+ goto unlock;
+ }
offset = snd_ctl_get_ioff(kctl, &info->id);
snd_ctl_build_ioff(&info->id, kctl, offset);
/*
@@ -1374,10 +1384,10 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
* which locks the element.
*/
- down_write(&card->controls_rwsem);
card->user_ctl_count++;
- up_write(&card->controls_rwsem);
+ unlock:
+ up_write(&card->controls_rwsem);
return 0;
}