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ALSA: pcm_dmaengine: Don't synchronize DMA channel when DMA is paused

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commit 88e98af9f4b5b0d60c1fe7f7f2701b5467691e75 upstream.

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>
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/1721198693-27636-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shengjiu Wang 2024-07-17 14:44:53 +08:00 committed by Greg Kroah-Hartman
parent ef88c1824a
commit 704393c1ed
1 changed files with 5 additions and 1 deletions
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4
sound/core/pcm_dmaengine.c
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@ -352,7 +352,11 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
int snd_dmaengine_pcm_sync_stop(struct snd_pcm_substream *substream) int snd_dmaengine_pcm_sync_stop(struct snd_pcm_substream *substream)
{ {
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(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_synchronize(prtd->dma_chan); dmaengine_synchronize(prtd->dma_chan);
return 0; return 0;