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UPSTREAM: ALSA: pcm_dmaengine: Properly synchronize DMA on shutdown

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Use the new dmaengine_synchronize() function to make sure that all complete
callbacks have finished running before the runtime data, which is accessed
in the completed callback, is freed.

This fixes a long standing use-after-free race condition that has been
observed on some systems.

Change-Id: Id99a1acaa2db537fcee6d10ecc94c831bb0a6faa
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
(cherry picked from commit bc0e734516)
This commit is contained in:
Lars-Peter Clausen
2015-10-20 11:46:31 +02:00
committed by Tao Huang
parent 12ffbc5dbd
commit f7fbeb90fd
1 changed files with 6 additions and 3 deletions
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9
sound/core/pcm_dmaengine.c
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@@ -305,13 +305,13 @@ int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
if (runtime->info & SNDRV_PCM_INFO_PAUSE)
dmaengine_pause(prtd->dma_chan);
else
dmaengine_terminate_all(prtd->dma_chan);
dmaengine_terminate_async(prtd->dma_chan);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
dmaengine_pause(prtd->dma_chan);
break;
case SNDRV_PCM_TRIGGER_STOP:
dmaengine_terminate_all(prtd->dma_chan);
dmaengine_terminate_async(prtd->dma_chan);
break;
default:
return -EINVAL;
@@ -450,6 +450,7 @@ int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
{
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
dmaengine_synchronize(prtd->dma_chan);
kfree(prtd);
return 0;
@@ -466,9 +467,11 @@ int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
{
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
dmaengine_synchronize(prtd->dma_chan);
dma_release_channel(prtd->dma_chan);
kfree(prtd);
return snd_dmaengine_pcm_close(substream);
return 0;
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);