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

[Thomas Fourier]

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

Fixes: d8701fe890ec ("mtd: rawnand: renesas: Add new NAND controller driver")
Cc: stable at vger.kernel.org
Signed-off-by: Thomas Fourier <fourier.thomas at gmail.com>
---
 drivers/mtd/nand/raw/renesas-nand-controller.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mtd/nand/raw/renesas-nand-controller.c b/drivers/mtd/nand/raw/renesas-nand-controller.c
index 44f6603736d1..f4a775571733 100644
--- a/drivers/mtd/nand/raw/renesas-nand-controller.c
+++ b/drivers/mtd/nand/raw/renesas-nand-controller.c
@@ -426,6 +426,10 @@ static int rnandc_read_page_hw_ecc(struct nand_chip *chip, u8 *buf,
 	/* Configure DMA */
 	dma_addr = dma_map_single(rnandc->dev, rnandc->buf, mtd->writesize,
 				  DMA_FROM_DEVICE);
+	if (dma_mapping_error(rnandc->dev, dma_addr)) {
+		dev_err(rnandc->dev, "DMA mapping failed.\n");
+		return -ENOMEM;
+	}
 	writel(dma_addr, rnandc->regs + DMA_ADDR_LOW_REG);
 	writel(mtd->writesize, rnandc->regs + DMA_CNT_REG);
 	writel(DMA_TLVL_MAX, rnandc->regs + DMA_TLVL_REG);
@@ -606,6 +610,10 @@ static int rnandc_write_page_hw_ecc(struct nand_chip *chip, const u8 *buf,
 	/* Configure DMA */
 	dma_addr = dma_map_single(rnandc->dev, (void *)rnandc->buf, mtd->writesize,
 				  DMA_TO_DEVICE);
+	if (dma_mapping_error(rnandc->dev, dma_addr)) {
+		dev_err(rnandc->dev, "DMA mapping failed.\n");
+		return -ENOMEM;
+	}
 	writel(dma_addr, rnandc->regs + DMA_ADDR_LOW_REG);
 	writel(mtd->writesize, rnandc->regs + DMA_CNT_REG);
 	writel(DMA_TLVL_MAX, rnandc->regs + DMA_TLVL_REG);
-- 
2.43.0