Commit 0b351865 authored Jun 16, 2014 by Nicolin Chen Committed by Vinod Koul Jul 25, 2014

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>

parent b1e51d77

drivers/dma/imx-sdma.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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 @@ static int __init sdma_init(struct sdma_engine *sdma)

		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;
		}