[PATCH] dmaengine: jz4780: fix resource leaks on error exit return

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

In two cases when jz4780_dma_setup_hwdesc fails, there is a memory
leak on the allocated desc and associated DMA pools on the error
exit return path.  Fix this by free'ing the resources before
returning.

Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/dma/dma-jz4780.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index c36c14c..7373b7a 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -324,8 +324,10 @@ static struct dma_async_tx_descriptor 
*jz4780_dma_prep_slave_sg(
                                              sg_dma_address(&sgl[i]),
                                              sg_dma_len(&sgl[i]),
                                              direction);
-               if (err < 0)
+               if (err < 0) {
+                       jz4780_dma_desc_free(&jzchan->desc->vdesc);
                        return NULL;
+               }
 
                desc->desc[i].dcm |= JZ_DMA_DCM_TIE;
 
@@ -368,8 +370,10 @@ static struct dma_async_tx_descriptor 
*jz4780_dma_prep_dma_cyclic(
        for (i = 0; i < periods; i++) {
                err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], buf_addr,
                                              period_len, direction);
-               if (err < 0)
+               if (err < 0) {
+                       jz4780_dma_desc_free(&jzchan->desc->vdesc);
                        return NULL;
+               }
 
                buf_addr += period_len;
 
-- 
2.9.3