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>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index bbcf783707f1..8269c200b53b 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -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;
 }