ASoC: sh: fsi: make sure fsi_stream_push/pop access by spin lock

fsi_stream_push/pop might be called in same time.
This patch protect it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index a1081c755239..a00fe37dfa4e 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -394,7 +394,10 @@ static void fsi_stream_push(struct fsi_priv *fsi,
 {
         struct fsi_stream *io = fsi_get_stream(fsi, is_play);
         struct snd_pcm_runtime *runtime = substream->runtime;
+        struct fsi_master *master = fsi_get_master(fsi);
+        unsigned long flags;
 
+        spin_lock_irqsave(&master->lock, flags);
         io->substream   = substream;
         io->buff_sample_capa    = fsi_frame2sample(fsi, runtime->buffer_size);
         io->buff_sample_pos     = 0;
@@ -402,13 +405,17 @@ static void fsi_stream_push(struct fsi_priv *fsi,
         io->period_pos          = 0;
         io->oerr_num    = -1; /* ignore 1st err */
         io->uerr_num    = -1; /* ignore 1st err */
+        spin_unlock_irqrestore(&master->lock, flags);
 }
 
 static void fsi_stream_pop(struct fsi_priv *fsi, int is_play)
 {
         struct fsi_stream *io = fsi_get_stream(fsi, is_play);
         struct snd_soc_dai *dai = fsi_get_dai(io->substream);
+        struct fsi_master *master = fsi_get_master(fsi);
+        unsigned long flags;
 
+        spin_lock_irqsave(&master->lock, flags);
 
         if (io->oerr_num > 0)
                 dev_err(dai->dev, "over_run = %d\n", io->oerr_num);
@@ -423,6 +430,7 @@ static void fsi_stream_pop(struct fsi_priv *fsi, int is_play)
         io->period_pos          = 0;
         io->oerr_num    = 0;
         io->uerr_num    = 0;
+        spin_unlock_irqrestore(&master->lock, flags);
 }
 
 static int fsi_get_current_fifo_samples(struct fsi_priv *fsi, int is_play)