[PATCH 5.10 116/121] dmaengine: sh: rcar-dmac: Check for error num after dma_set_max_seg_size

Greg Kroah-Hartman
2022-02-21T09:16:24Z

From: Jiasheng Jiang <jiasheng@iscas.ac.cn>

commit da2ad87fba0891576aadda9161b8505fde81a84d upstream.

As the possible failure of the dma_set_max_seg_size(), it should be
better to check the return value of the dma_set_max_seg_size().

Fixes: 97d49c59e219 ("dmaengine: rcar-dmac: set scatter/gather max segment size")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220111011239.452837-1-jiasheng@iscas.ac.cn
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/dma/sh/rcar-dmac.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -1844,7 +1844,10 @@ static int rcar_dmac_probe(struct platfo

dmac->dev = &pdev->dev;
platform_set_drvdata(pdev, dmac);
- dma_set_max_seg_size(dmac->dev, RCAR_DMATCR_MASK);
+ ret = dma_set_max_seg_size(dmac->dev, RCAR_DMATCR_MASK);
+ if (ret)
+ return ret;
+
ret = dma_set_mask_and_coherent(dmac->dev, DMA_BIT_MASK(40));
if (ret)
return ret;