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, 4 insertions, 5 deletions

diff --git a/configfs.c b/configfs.c
index 4f88bf8..8f2d452 100644
--- a/configfs.c
+++ b/configfs.c
@@ -285,8 +285,7 @@ static void cfg_snd_avirt_stream_release(struct config_item *item)
 	}
 
 	D_INFOK("Release stream: %s", stream->name);
-	kfree(stream->pcm_ops);
-	kfree(stream);
+	snd_avirt_stream_try_destroy(stream);
 }
 
 static void cfg_snd_avirt_route_release(struct config_item *item)
@@ -420,12 +419,12 @@ cfg_snd_avirt_stream_group_configured_store(struct config_item *item,
 
 	CHK_ERR(kstrtoul(p, 10, &tmp));
 
-	if (tmp != 1) {
-		D_ERRORK("streams can only be sealed, not unsealed!");
+	if (tmp > 1) {
+		D_ERRORK("Configure streams must be 0 or 1!");
 		return -ERANGE;
 	}
 
-	snd_avirt_streams_seal();
+	(tmp) ? snd_avirt_streams_configure() : snd_avirt_streams_unconfigure();
 
 	return count;
 }