[PATCH v2] mtd: rawnand: atmel: Add missing check after DMA map

[Thomas Fourier]

The DMA map functions can fail and should be tested for errors.

Fixes: 4774fb0a48aa ("mtd: nand/fsmc: Add DMA support")
Signed-off-by: Thomas Fourier <fourier.thomas at gmail.com>
---
v1 -> v2:
- Add stable at vger.kernel.org
- Fix subject prefix
 
 drivers/mtd/nand/raw/fsmc_nand.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mtd/nand/raw/fsmc_nand.c b/drivers/mtd/nand/raw/fsmc_nand.c
index d579d5dd60d6..df61db8ce466 100644
--- a/drivers/mtd/nand/raw/fsmc_nand.c
+++ b/drivers/mtd/nand/raw/fsmc_nand.c
@@ -503,6 +503,8 @@ static int dma_xfer(struct fsmc_nand_data *host, void *buffer, int len,
 
 	dma_dev = chan->device;
 	dma_addr = dma_map_single(dma_dev->dev, buffer, len, direction);
+	if (dma_mapping_error(dma_dev->dev, dma_addr))
+		return -EINVAL;
 
 	if (direction == DMA_TO_DEVICE) {
 		dma_src = dma_addr;
-- 
2.43.0