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ASoC: PXA: Fix oops in __pxa2xx_pcm_prepare

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pxa2xx_pcm_hw_free frees dma channel and sets prtd->dma_ch to -1,
but does not set prtd->params to NULL, so if pxa2xx_pcm_hw_params will
be called immediately, it leaves prtd->dma_ch initialized with -1,
and it results in oops in __pxa2xx_pcm_prepare. This bug is triggered
via SDL.

This patch adds check for prtd->dma_ch to __pxa2xx_pcm_prepare and
cleans prtd->params, so now it works properly.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Vasily Khoruzhick 2011-04-02 10:54:47 +03:00 committed by Mark Brown
parent efd6947945
commit 97c96c076b
2 changed files with 4 additions and 0 deletions
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3
sound/arm/pxa2xx-pcm-lib.c
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@ -140,6 +140,9 @@ int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
if (!prtd || !prtd->params)
return 0;
if (prtd->dma_ch == -1)
return -EINVAL;
DCSR(prtd->dma_ch) &= ~DCSR_RUN;
DCSR(prtd->dma_ch) = 0;
DCMD(prtd->dma_ch) = 0;

1
sound/soc/pxa/pxa2xx-pcm.c
View file

@ -65,6 +65,7 @@ static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
if (prtd->dma_ch >= 0) {
pxa_free_dma(prtd->dma_ch);
prtd->dma_ch = -1;
prtd->params = NULL;
}
return 0;