[PATCH v1 05/19] mtd: rawnand: marvell: Fix error handle regarding dma_map_sg

From: Jack Wang
Date: Fri Aug 19 2022 - 02:08:47 EST


dma_map_sg return 0 on error, in case of error return -EIO,
also add the dma_unmap_sg as rollback on the following error.

Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Vignesh Raghavendra <vigneshr@xxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>
Cc: Cai Huoqing <cai.huoqing@xxxxxxxxx>
Cc: linux-mtd@xxxxxxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
---
drivers/mtd/nand/raw/marvell_nand.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/marvell_nand.c b/drivers/mtd/nand/raw/marvell_nand.c
index 2455a581fd70..d9f2f1d0b5ef 100644
--- a/drivers/mtd/nand/raw/marvell_nand.c
+++ b/drivers/mtd/nand/raw/marvell_nand.c
@@ -865,13 +865,19 @@ static int marvell_nfc_xfer_data_dma(struct marvell_nfc *nfc,
marvell_nfc_enable_dma(nfc);
/* Prepare the DMA transfer */
sg_init_one(&sg, nfc->dma_buf, dma_len);
- dma_map_sg(nfc->dma_chan->device->dev, &sg, 1, direction);
+ ret = dma_map_sg(nfc->dma_chan->device->dev, &sg, 1, direction);
+ if (!ret) {
+ dev_err(nfc->dev, "Could not map DMA S/G list\n");
+ return -ENXIO;
+ }
+
tx = dmaengine_prep_slave_sg(nfc->dma_chan, &sg, 1,
direction == DMA_FROM_DEVICE ?
DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT);
if (!tx) {
dev_err(nfc->dev, "Could not prepare DMA S/G list\n");
+ dma_unmap_sg(nfc->dma_chan->device->dev, &sg, 1, direction);
return -ENXIO;
}

--
2.34.1