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dmaengine: imx-sdma: Save imx_dma_data into sdmac 

The filter() function is currently called by xlate() while it transfers
imx_dma_data as a local variable to the filter() but releases the data
right after returning a DMA channel pointer, which results chan->private
pointing an invalid memory space.

So this patch just stores the imx_dma_data into sdmac to make usre the
private pointer valid as long as the channel exists.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Nicolin Chen 2014-06-16 11:32:29 +08:00 committed by Vinod Koul
parent b1e51d771f
commit 0b3518652c
1 changed files with 4 additions and 1 deletions
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5
drivers/dma/imx-sdma.c
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@ -271,6 +271,7 @@ struct sdma_channel {
unsigned int chn_count;
unsigned int chn_real_count;
struct tasklet_struct tasklet;
struct imx_dma_data data;
};
#define IMX_DMA_SG_LOOP BIT(0)
@ -1413,12 +1414,14 @@ err_dma_alloc:
static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct imx_dma_data *data = fn_param;
if (!imx_dma_is_general_purpose(chan))
return false;
chan->private = data;
sdmac->data = *data;
chan->private = &sdmac->data;
return true;
}