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

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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>
This commit is contained in:
Troy Kisky 2009-09-11 14:29:02 -07:00 committed by Mark Brown
parent df0fd5e5e1
commit 81ac55aa14
2 changed files with 7 additions and 8 deletions
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3
sound/soc/davinci/davinci-i2s.c
View File

@ -353,8 +353,9 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai) 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_mcbsp_dev *dev = dai->private_data;
struct davinci_pcm_dma_params *dma_params =
dev->dma_params[substream->stream];
struct snd_interval *i = NULL; struct snd_interval *i = NULL;
int mcbsp_word_length; int mcbsp_word_length;
unsigned int rcr, xcr, srgr; unsigned int rcr, xcr, srgr;

12
sound/soc/davinci/davinci-pcm.c
View File

@ -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) static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
{ {
struct davinci_runtime_data *prtd = substream->runtime->private_data; 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; struct edmacc_param p_ram;
int ret; int ret;
if (!dma_data)
return -ENODEV;
prtd->params = dma_data;
/* Request master DMA channel */ /* Request master DMA channel */
ret = edma_alloc_channel(prtd->params->channel, ret = edma_alloc_channel(prtd->params->channel,
davinci_pcm_dma_irq, substream, 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 snd_pcm_runtime *runtime = substream->runtime;
struct davinci_runtime_data *prtd; struct davinci_runtime_data *prtd;
int ret = 0; 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); snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
/* ensure that buffer size is a multiple of period size */ /* 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; return -ENOMEM;
spin_lock_init(&prtd->lock); spin_lock_init(&prtd->lock);
prtd->params = params;
runtime->private_data = prtd; runtime->private_data = prtd;