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ALSA: dice: clear device lock when closing hwdep device

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Ensure that misbehaving or aborted userspace programs do not
accidentally keep the lock.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2011-09-04 22:14:54 +02:00
parent 0c29c9180f
commit 9dd81e3143
1 changed files with 13 additions and 0 deletions
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13
sound/firewire/dice.c
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@ -966,6 +966,18 @@ static int dice_hwdep_unlock(struct dice *dice)
return err;
}
static int dice_hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
struct dice *dice = hwdep->private_data;
spin_lock_irq(&dice->lock);
if (dice->dev_lock_count == -1)
dice->dev_lock_count = 0;
spin_unlock_irq(&dice->lock);
return 0;
}
static int dice_hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
@ -998,6 +1010,7 @@ static int dice_create_hwdep(struct dice *dice)
{
static const struct snd_hwdep_ops ops = {
.read = dice_hwdep_read,
.release = dice_hwdep_release,
.poll = dice_hwdep_poll,
.ioctl = dice_hwdep_ioctl,
.ioctl_compat = dice_hwdep_compat_ioctl,