linux-kernel - [PATCH] dma: imx-sdma: Save imx_dma

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Date:	Mon, 16 Jun 2014 11:32:29 +0800
From:	Nicolin Chen <nicoleotsuka@...il.com>
To:	<vinod.koul@...el.com>, <s.hauer@...gutronix.de>
CC:	<dan.j.williams@...el.com>, <linux-kernel@...r.kernel.org>,
	<dmaengine@...r.kernel.org>
Subject: [PATCH] dma: 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@...il.com>
---
 drivers/dma/imx-sdma.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 19041ce..fc04add 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -270,6 +270,7 @@ 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)
@@ -1402,12 +1403,14 @@ 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;
 }
-- 
1.8.4

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