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authorVasily Khoruzhick <anarsoul@gmail.com>2011-04-02 10:54:47 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-04-03 18:48:56 +0900
commit97c96c076b8ef86533f2427ea145a9cd0ec5564f (patch)
tree3bcedb97c64864b3811699cb1ea865ef95e76c3e /sound/arm
parentefd6947945fe5ebcf759e762f51c4e1d867edc49 (diff)
downloadlinux-linaro-precise-97c96c076b8ef86533f2427ea145a9cd0ec5564f.tar.gz
ASoC: PXA: Fix oops in __pxa2xx_pcm_prepare
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>
Diffstat (limited to 'sound/arm')
-rw-r--r--sound/arm/pxa2xx-pcm-lib.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/arm/pxa2xx-pcm-lib.c b/sound/arm/pxa2xx-pcm-lib.c
index 8808b82311b..76e0d569507 100644
--- a/sound/arm/pxa2xx-pcm-lib.c
+++ b/sound/arm/pxa2xx-pcm-lib.c
@@ -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;