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-rw-r--r--sound/soc/kirkwood/kirkwood-dma.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c
index 4cf2245..dbfdfe9 100644
--- a/sound/soc/kirkwood/kirkwood-dma.c
+++ b/sound/soc/kirkwood/kirkwood-dma.c
@@ -148,10 +148,14 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream)
dram = mv_mbus_dram_info();
addr = substream->dma_buffer.addr;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (priv->substream_play)
+ return -EBUSY;
priv->substream_play = substream;
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_PLAYBACK_WIN, addr, dram);
} else {
+ if (priv->substream_rec)
+ return -EBUSY;
priv->substream_rec = substream;
kirkwood_dma_conf_mbus_windows(priv->io,
KIRKWOOD_RECORD_WIN, addr, dram);
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