4.19-stable review patch. If anyone has any objections, please let me know.
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From: Shengjiu Wang shengjiu.wang@nxp.com
[ Upstream commit 6a7db25aad8ce6512b366d2ce1d0e60bac00a09d ]
When dmaengine supports pause function, in suspend state, dmaengine_pause() is called instead of dmaengine_terminate_async(),
In end of playback stream, the runtime->state will go to SNDRV_PCM_STATE_DRAINING, if system suspend & resume happen at this time, application will not resume playback stream, the stream will be closed directly, the dmaengine_terminate_async() will not be called before the dmaengine_synchronize(), which violates the call sequence for dmaengine_synchronize().
This behavior also happens for capture streams, but there is no SNDRV_PCM_STATE_DRAINING state for capture. So use dmaengine_tx_status() to check the DMA status if the status is DMA_PAUSED, then call dmaengine_terminate_async() to terminate dmaengine before dmaengine_synchronize().
Signed-off-by: Shengjiu Wang shengjiu.wang@nxp.com Link: https://patch.msgid.link/1718851218-27803-1-git-send-email-shengjiu.wang@nxp... Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- sound/core/pcm_dmaengine.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 6f6da1128edc2..80188d5c11187 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -354,6 +354,12 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream) { struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); + struct dma_tx_state state; + enum dma_status status; + + status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); + if (status == DMA_PAUSED) + dmaengine_terminate_async(prtd->dma_chan);
dmaengine_synchronize(prtd->dma_chan); kfree(prtd); @@ -371,6 +377,12 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close); int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream) { struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); + struct dma_tx_state state; + enum dma_status status; + + status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); + if (status == DMA_PAUSED) + dmaengine_terminate_async(prtd->dma_chan);
dmaengine_synchronize(prtd->dma_chan); dma_release_channel(prtd->dma_chan);