[alsa-devel] [PATCH] a52: Ignore start request if we're already running

[David Henningsson]

When trying to start a PCM that's already running, the result is EBADFD.
We might have implicitly started the buffer by filling it up,
so just ignore this request if we're already running.

Reported-by: Chow Loong Jin <hyperair at ubuntu.com>
Signed-off-by: David Henningsson <david.henningsson at canonical.com>
---
 a52/pcm_a52.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/a52/pcm_a52.c b/a52/pcm_a52.c
index b467ec8..59e25cb 100644
--- a/a52/pcm_a52.c
+++ b/a52/pcm_a52.c
@@ -482,6 +482,12 @@ static int a52_start(snd_pcm_ioplug_t *io)
 {
 	struct a52_ctx *rec = io->private_data;
 
+	/* When trying to start a PCM that's already running, the result is
+	   EBADFD. We might have implicitly started the buffer by filling it
+	   up, so just ignore this request if we're already running. */
+	if (snd_pcm_state(rec->slave) == SND_PCM_STATE_RUNNING)
+		return 0;
+
 	return snd_pcm_start(rec->slave);
 }
 
-- 
1.9.1