linux-kernel - [PATCH 5.15 187/196] dmaengine: sh: rcar-dmac: Check for error num after dma_set_max_seg

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Message-Id: <20220221084937.206219394@linuxfoundation.org>
Date:   Mon, 21 Feb 2022 09:50:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.15 187/196] dmaengine: sh: rcar-dmac: Check for error num after dma_set_max_seg_size

From: Jiasheng Jiang <jiasheng@...as.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@...der.be>
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Link: https://lore.kernel.org/r/20220111011239.452837-1-jiasheng@iscas.ac.cn
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -1868,7 +1868,10 @@ 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;