diff options
| author | Stephen Warren <swarren@nvidia.com> | 2011-08-04 16:44:42 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-17 10:55:53 -0700 |
| commit | ca42ad986d2012e7658ac8611c4cf4c6a91f78f6 (patch) | |
| tree | 074b9c1d554b1eea401a9b6a80ac44d13f5f619d | |
| parent | ee73429151fbedb9381fb737fb7c732fbddf04f1 (diff) | |
ASoC: Tegra: tegra_pcm_deallocate_dma_buffer: Don't OOPS
commit a96edd59b2bc88b3d1ea47e0ba48076d65db9302 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | sound/soc/tegra/tegra_pcm.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c index 3c271f953582..620171051e6e 100644 --- a/sound/soc/tegra/tegra_pcm.c +++ b/sound/soc/tegra/tegra_pcm.c @@ -309,9 +309,14 @@ static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream) { - struct snd_pcm_substream *substream = pcm->streams[stream].substream; - struct snd_dma_buffer *buf = &substream->dma_buffer; + struct snd_pcm_substream *substream; + struct snd_dma_buffer *buf; + + substream = pcm->streams[stream].substream; + if (!substream) + return; + buf = &substream->dma_buffer; if (!buf->area) return; |