Add the check for the return value of the dma_pool_create and return the
error if it fails, in order to avoid NULL pointer dereference in the
fsl_edma_alloc_desc.

Fixes: d6be34fbd39b ("dma: Add Freescale eDMA engine driver support")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
 drivers/dma/fsl-edma-common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index a06a1575a2a5..a24095c941b6 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -658,6 +658,9 @@ int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
 	fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
 				sizeof(struct fsl_edma_hw_tcd),
 				32, 0);
+	if (!fsl_chan->tcd_pool)
+		return -ENOMEM;
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(fsl_edma_alloc_chan_resources);
-- 
2.25.1