linux-kernel - ASoC: soc-pcm: disconnect BEs if the FE is not ready

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Date:   Fri, 25 Dec 2020 16:42:46 +0800 (GMT+08:00)
From:   朱灿灿 <zhucancan@...o.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Cc:     kernel@...o.com, trivial@...nel.org, zhucancan@...o.com
Subject: ASoC: soc-pcm: disconnect BEs if the FE is not ready

FE is connected to two BEs, BE1 is active, BE2 is deactive.
When closing BE1, FE/BE1 is in HW_FREE state, then BE2 is
startup by mixer runtime update.

For FE is in HW_FREE state, dpcm_run_update_startup() will skip
BE2's startup because FE's state is HW_FREE, BE2 stays in FE's
be_clients list.

During FE's closed, the dpcm_fe_dai_close() will close all related
BEs, BE2 will be closed. This will lead to BE2's dpcm[stream].users
mismatch.

We need disconnet all pending BEs in the corner case.

Signed-off-by: zhucancan <zhucancan@...o.com>
---
 sound/soc/soc-pcm.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index dcab9527ba3d..04ad53f0ae4f 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -2451,8 +2451,11 @@ static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
 
 	/* Only start the BE if the FE is ready */
 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
-		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
-		return -EINVAL;
+		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
+		dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
+			fe->dai_link->name, fe->dpcm[stream].state);
+		goto disconnect;
+	}
 
 	/* startup must always be called for new BEs */
 	ret = dpcm_be_dai_startup(fe, stream);
@@ -2513,12 +2516,18 @@ static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
 close:
 	dpcm_be_dai_shutdown(fe, stream);
 disconnect:
-	/* disconnect any closed BEs */
+	/* disconnect any pending BEs */
 	spin_lock_irqsave(&fe->card->dpcm_lock, flags);
 	for_each_dpcm_be(fe, stream, dpcm) {
 		struct snd_soc_pcm_runtime *be = dpcm->be;
-		if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
-			dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
+			be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
+				dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 	}
 	spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
 
-- 
2.21.0