When suspended, the DMA channel may enter PAUSE state if dmaengine_pause() is supported by DMA. At this state, dmaengine_synchronize() should not be called, otherwise the DMA channel can't be resumed successfully.

Fixes: e8343410ddf0 ("ALSA: dmaengine: Synchronize dma channel after drop()") Signed-off-by: Shengjiu Wang shengjiu.wang@nxp.com --- sound/core/pcm_dmaengine.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index b54336d4bffc..b134a51b3fd5 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -352,8 +352,12 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); int snd_dmaengine_pcm_sync_stop(struct snd_pcm_substream *substream) { struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); + struct dma_tx_state state; + enum dma_status status;

- dmaengine_synchronize(prtd->dma_chan); + status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); + if (status != DMA_PAUSED) + dmaengine_synchronize(prtd->dma_chan);

return 0; }