Introduce 'unconfigure' callback

The 'unconfigure' callback can be used to clean up the 'configured'
state of an Audio Path, for when it is desired to reset the streams,
and/or reload a different stream configuration.

To destroy the streams, we must attempt to force their PCMs
closed. Take note though, that if a PCM is being written to when
an unconfigure command is issued, system instability may occur.

Signed-off-by: Mark Farrugia <mark.farrugia@fiberdyne.com.au>

1 files changed, 11 insertions, 0 deletions

diff --git a/loopback/loopback.c b/loopback/loopback.c
index de0f38a..49c188d 100644
--- a/loopback/loopback.c
+++ b/loopback/loopback.c
@@ -1080,6 +1080,14 @@ static int loopbackap_configure(struct snd_card *card,
 	return 0;
 }
 
+static int loopbackap_unconfigure(void)
+{
+	mutex_destroy(&loopback->cable_lock);
+	kfree(loopback);
+
+	return 0;
+}
+
 /*******************************************************************************
  * Loopback Audio Path AVIRT registration
  ******************************************************************************/
@@ -1091,6 +1099,7 @@ static struct snd_avirt_audiopath loopbackap_module = {
 	.pcm_playback_ops = &loopbackap_pcm_ops,
 	.pcm_capture_ops = &loopbackap_pcm_ops,
 	.configure = loopbackap_configure,
+	.unconfigure = loopbackap_unconfigure,
 };
 
 static int __init alsa_card_loopback_init(void)
@@ -1108,6 +1117,8 @@ static int __init alsa_card_loopback_init(void)
 
 static void __exit alsa_card_loopback_exit(void)
 {
+	mutex_destroy(&loopback->cable_lock);
+	kfree(loopback);
 	snd_avirt_audiopath_deregister(&loopbackap_module);
 }