ASoC: DaVinci: Fix divide by zero error during 1st execution

When both playback and capture stream were open
davinci_i2s_hw_params was setting parameters for
the wrong stream. The fix for davinci_i2s_hw_params
is sufficient, but it looks like a race still happens
in davici_pcm_open. This patch also makes the race smaller
but the next patch provides a better fix.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index 12a6c54..d32e197 100644 (file)
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -353,8 +353,9 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *params,
                                 struct snd_soc_dai *dai)
 {
-       struct davinci_pcm_dma_params *dma_params = dai->dma_data;
        struct davinci_mcbsp_dev *dev = dai->private_data;
+       struct davinci_pcm_dma_params *dma_params =
+                                       dev->dma_params[substream->stream];
        struct snd_interval *i = NULL;
        int mcbsp_word_length;
        unsigned int rcr, xcr, srgr;

diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
index 091dacb..002808b 100644 (file)
--- a/sound/soc/davinci/davinci-pcm.c
+++ b/sound/soc/davinci/davinci-pcm.c
@@ -126,16 +126,9 @@ static void davinci_pcm_dma_irq(unsigned lch, u16 ch_status, void *data)
 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 {
        struct davinci_runtime_data *prtd = substream->runtime->private_data;
-       struct snd_soc_pcm_runtime *rtd = substream->private_data;
-       struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
        struct edmacc_param p_ram;
        int ret;
 
-       if (!dma_data)
-               return -ENODEV;
-
-       prtd->params = dma_data;
-
        /* Request master DMA channel */
        ret = edma_alloc_channel(prtd->params->channel,
                                  davinci_pcm_dma_irq, substream,
@@ -244,6 +237,10 @@ static int davinci_pcm_open(struct snd_pcm_substream *substream)
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct davinci_runtime_data *prtd;
        int ret = 0;
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct davinci_pcm_dma_params *params = rtd->dai->cpu_dai->dma_data;
+       if (!params)
+               return -ENODEV;
 
        snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
        /* ensure that buffer size is a multiple of period size */
@@ -257,6 +254,7 @@ static int davinci_pcm_open(struct snd_pcm_substream *substream)
                return -ENOMEM;
 
        spin_lock_init(&prtd->lock);
+       prtd->params = params;
 
        runtime->private_data = prtd;