ASoC: dpcm: fix BE dai not hw_free and shutdown

BugLink: https://bugs.launchpad.net/bugs/1791953

[ Upstream commit 9c0ac70a ]

In case, one BE is used by two FE1/FE2
FE1--->BE-->
       |
FE2----]
when FE1/FE2 call dpcm_be_dai_hw_free() together
the BE users will be 2 (> 1), hence cannot be hw_free
the be state will leave at, ex. SND_SOC_DPCM_STATE_STOP

later FE1/FE2 call dpcm_be_dai_shutdown(),
will be skip due to wrong state.
leaving the BE not being hw_free and shutdown.

The BE dai will be hw_free later when calling
dpcm_be_dai_shutdown() if still in invalid state.
Signed-off-by: KaiChieh Chuang <kaichieh.chuang@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

sound/soc/soc-pcm.c

@@ -1682,8 +1682,10 @@ int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
 			continue;
 
 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
-		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
-			continue;
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
+			soc_pcm_hw_free(be_substream);
+			be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
+		}
 
 		dev_dbg(be->dev, "ASoC: close BE %s\n",
 			dpcm->fe->dai_link->name);