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ASoC: Fix DMA channel leak in imx-pcm-dma-mx2 driver.

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"snd_imx_pcm_hw_params" callback can be called
several times by the user (i.e. OSS emulation)
leading to a DMA channel leak.

Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Javier Martin 2012-01-12 12:30:38 +01:00 committed by Mark Brown
parent 36ae1a96c4
commit 220d9f2595
1 changed files with 7 additions and 5 deletions
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12
sound/soc/imx/imx-pcm-dma-mx2.c
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@ -88,11 +88,13 @@ static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
iprtd->dma_data.dma_request = dma_params->dma;
/* Try to grab a DMA channel */
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
if (!iprtd->dma_chan)
return -EINVAL;
if (!iprtd->dma_chan) {
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
if (!iprtd->dma_chan)
return -EINVAL;
}
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE: