ALSA: dice: clear device lock when closing hwdep device
Ensure that misbehaving or aborted userspace programs do not
accidentally keep the lock.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 7225878..ef04089 100644
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -966,6 +966,18 @@
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 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,