[PATCH AUTOSEL for 4.9 038/100] ASoC: STI: Fix reader substream pointer set

[alexander . levin]

From: Arnaud Pouliquen <arnaud.pouliq...@st.com>

[ Upstream commit 3c9d3f1bc2defd418b5933bbc928096c9c686d3b ]

reader->substream is used in IRQ handler for error case but is never set.
Set value to pcm substream on DAI startup and clean it on dai shutdown.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliq...@st.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
---
 sound/soc/sti/uniperif_reader.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/sti/uniperif_reader.c b/sound/soc/sti/uniperif_reader.c
index 0e1c3ee56675..9735b4caaed3 100644
--- a/sound/soc/sti/uniperif_reader.c
+++ b/sound/soc/sti/uniperif_reader.c
@@ -364,6 +364,8 @@ static int uni_reader_startup(struct snd_pcm_substream 
*substream,
        struct uniperif *reader = priv->dai_data.uni;
        int ret;
 
+       reader->substream = substream;
+
        if (!UNIPERIF_TYPE_IS_TDM(reader))
                return 0;
 
@@ -393,6 +395,7 @@ static void uni_reader_shutdown(struct snd_pcm_substream 
*substream,
                /* Stop the reader */
                uni_reader_stop(reader);
        }
+       reader->substream = NULL;
 }
 
 static const struct snd_soc_dai_ops uni_reader_dai_ops = {
-- 
2.11.0