[Patch V1] imx: i2c: fix i2c resource leak with dma transfer

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In i2c_imx_dma_xfer(), when dmaengine_prep_slave_single() returns
NULL, the context goto label err_desc and then return. However,
the memory allocated by dmaengine_prep_slave_single() has not been
freed yet, which leads to resource leak.

(reported by coverity check)

Signed-off-by: Gao Pan <b54642@xxxxxxxxxxxxx>
Signed-off-by: Fugang Duan <B38611@xxxxxxxxxxxxx>
---
 drivers/i2c/busses/i2c-imx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 0ab8424..6dcfff5 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -397,6 +397,7 @@ static int i2c_imx_dma_xfer(struct imx_i2c_struct *i2c_imx,
 
 err_submit:
 err_desc:
+	dmaengine_terminate_all(dma->chan_using);
 	dma_unmap_single(chan_dev, dma->dma_buf,
 			dma->dma_len, dma->dma_data_dir);
 err_map:
-- 
1.9.1

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