dmaengine: sh: rcar-dmac: Check for error num after setting mask

stable inclusion
from stable-v5.10.102
commit 4f907b6eb701a5f7c56bc401197eb3b51db0cd8d
bugzilla: https://gitee.com/openeuler/kernel/issues/I567K6

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4f907b6eb701a5f7c56bc401197eb3b51db0cd8d

--------------------------------

commit 2d21543e upstream.

Because of the possible failure of the dma_supported(), the
dma_set_mask_and_coherent() may return error num.
Therefore, it should be better to check it and return the error if
fails.

Fixes: dc312349 ("dmaengine: rcar-dmac: Widen DMA mask to 40 bits")
Signed-off-by: NJiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220106030939.2644320-1-jiasheng@iscas.ac.cnSigned-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYu Liao <liaoyu15@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/dma/sh/rcar-dmac.c

@@ -1845,7 +1845,9 @@ 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);
-	dma_set_mask_and_coherent(dmac->dev, DMA_BIT_MASK(40));
+	ret = dma_set_mask_and_coherent(dmac->dev, DMA_BIT_MASK(40));
+	if (ret)
+		return ret;
 
 	ret = rcar_dmac_parse_of(&pdev->dev, dmac);
 	if (ret < 0)