ASoC: do not close shared backend dailink

BugLink: http://bugs.launchpad.net/bugs/1711526
commit b1cd2e34c69a2f3988786af451b6e17967c293a0 upstream.

Multiple frontend dailinks may be connected to a backend
dailink at the same time. When one of frontend dailinks is
closed, the associated backend dailink should not be closed
if it is connected to other active frontend dailinks. Change
ensures that backend dailink is closed only after all
connected frontend dailinks are closed.

Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: Patrick Lai <plai@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index a1e605bbc46530b3c87b3e8f5922b6172bdae352..977066ba176912be118c395ffd0f34d54c84bf7c 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -181,6 +181,10 @@ int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
                dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
                                be->dai_link->name, event, dir);
 
+               if ((event == SND_SOC_DAPM_STREAM_STOP) &&
+                   (be->dpcm[dir].users >= 1))
+                       continue;
+
                snd_soc_dapm_stream_event(be, dir, event);
        }