Fix missing 'close' PCM callback

We need to have to close PCM callback set, otherwise we get
a kernel crash when the PCM middle layer attempts to dereference
a NULL pointer.

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

1 files changed, 17 insertions, 0 deletions

diff --git a/pcm.c b/pcm.c
index 411db40..0c6afa9 100644
--- a/pcm.c
+++ b/pcm.c
@@ -92,6 +92,22 @@ static int pcm_open(struct snd_pcm_substream *substream)
 }
 
 /**
+ * pcm_close - Implements 'close' callback for PCM middle layer
+ * @substream: pointer to ALSA PCM substream
+ * 
+ * This is called when a PCM substream is closed.
+ * 
+ * Returns 0 on success or error code otherwise.
+ */
+static int pcm_close(struct snd_pcm_substream *substream)
+{
+	// Do additional Audio Path 'close' callback
+	return DO_AUDIOPATH_CB(
+		(struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath,
+		close, substream);
+}
+
+/**
  * pcm_hw_params - Implements 'hw_params' callback for PCM middle layer
  * @substream: pointer to ALSA PCM substream
  * @hw_params: contains the hardware parameters for the PCM
@@ -154,6 +170,7 @@ static int pcm_hw_free(struct snd_pcm_substream *substream)
  */
 struct snd_pcm_ops pcm_ops_avirt = {
 	.open = pcm_open,
+	.close = pcm_close,
 	.ioctl = snd_pcm_lib_ioctl,
 	.hw_params = pcm_hw_params,
 	.hw_free = pcm_hw_free,