ASoC: Tegra: tegra_pcm_deallocate_dma_buffer: Don't OOPS
Not all PCM devices have all sub-streams. Specifically, the SPDIF driver only supports playback and hence has no capture substream. Check whether a substream exists before dereferencing it, when de-allocating DMA buffers in tegra_pcm_deallocate_dma_buffer. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Liam Girdwood <lrg@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: stable@kernel.org
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@ -309,9 +309,14 @@ static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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struct snd_dma_buffer *buf;
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substream = pcm->streams[stream].substream;
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if (!substream)
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return;
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buf = &substream->dma_buffer;
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if (!buf->area)
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if (!buf->area)
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return;
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return;
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