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ASoC: core: Fix possible NULL pointer dereference of pcm->config

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Since the soc generic dmaengine pcm driver allows using the defualt settings,
so the pcm->config maybe NULL.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Xiubo Li 2014-01-16 16:08:04 +08:00 committed by Mark Brown
parent d70e861a31
commit ec4f2857cd
1 changed files with 6 additions and 3 deletions
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9
sound/soc/soc-generic-dmaengine-pcm.c
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@ -176,17 +176,20 @@ static struct dma_chan *dmaengine_pcm_compat_request_channel(
{
struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
struct snd_dmaengine_dai_dma_data *dma_data;
dma_filter_fn fn = NULL;
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
return pcm->chan[0];
if (pcm->config->compat_request_channel)
if (pcm->config && pcm->config->compat_request_channel)
return pcm->config->compat_request_channel(rtd, substream);
return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
dma_data->filter_data);
if (pcm->config)
fn = pcm->config->compat_filter_fn;
return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data);
}
static bool dmaengine_pcm_can_report_residue(struct dma_chan *chan)