linux-kernel - [PATCH 3.18 59/92] ASoC: do not close shared backend dailink

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Message-Id: <20170809202157.950971721@linuxfoundation.org>
Date:   Wed,  9 Aug 2017 13:37:27 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Gopikrishnaiah Anandan <agopik@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Patrick Lai <plai@...eaurora.org>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 3.18 59/92] ASoC: do not close shared backend dailink

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Banajit Goswami <bgoswami@...eaurora.org>

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@...eaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@...eaurora.org>
Signed-off-by: Patrick Lai <plai@...eaurora.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/soc-pcm.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -163,6 +163,10 @@ int dpcm_dapm_stream_event(struct snd_so
 		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);
 	}