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sound jz4740_pcm: Don't request dma channel mor then once.

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It is possible that the hw_params callback is called multiple times when using
the oss emulation layer. Thus we need to check whether the dma channel has
already been requested otherwise we'll end up with all dma channels being
requested by sound driver.

SVN-Revision: 20369
This commit is contained in:
Lars-Peter Clausen 2010-03-22 15:22:26 +00:00
parent f4bcf74b95
commit fd3344d488
1 changed files with 5 additions and 4 deletions
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5
target/linux/xburst/files-2.6.32/sound/soc/jz4740/jz4740-pcm.c
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@ -105,9 +105,10 @@ static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
struct jz4740_pcm_config *config;
config = rtd->dai->cpu_dai->dma_data;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (!prtd->dma) {
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
prtd->dma = jz4740_dma_request(substream, "PCM Playback");
} else {
else
prtd->dma = jz4740_dma_request(substream, "PCM Capture");
}