linux-kernel - [PATCH] dmaengine: sh: rcar-dmac: Check for error num after dma_set_max_seg

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Date:   Tue, 11 Jan 2022 09:12:39 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     geert@...ux-m68k.org
Cc:     vkoul@...nel.org, yoshihiro.shimoda.uh@...esas.com,
        laurent.pinchart@...asonboard.com,
        wsa+renesas@...g-engineering.com, zou_wei@...wei.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] dmaengine: sh: rcar-dmac: Check for error num after dma_set_max_seg_size

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@...der.be>
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/dma/sh/rcar-dmac.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 6885b3dcd7a9..63a0c8cb46b3 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -1868,7 +1868,10 @@ static int rcar_dmac_probe(struct platform_device *pdev)
 
 	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;
+
 	dma_set_mask_and_coherent(dmac->dev, DMA_BIT_MASK(40));
 
 	ret = rcar_dmac_parse_of(&pdev->dev, dmac);
-- 
2.25.1