linux-kernel - [PATCH] spi: qcom: geni: Simplify DMA setting

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Message-Id: <1b14e4ce91a33c16b2c655389c728071a9c9aa2e.1641643601.git.christophe.jaillet@wanadoo.fr>
Date:   Sat,  8 Jan 2022 13:07:54 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     agross@...nel.org, bjorn.andersson@...aro.org, broonie@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] spi: qcom: geni: Simplify DMA setting

As stated in [1], dma_set_mask() with a 64-bit mask will never fail if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

Simplify code and remove some dead code accordingly.

[1]: https://lkml.org/lkml/2021/6/7/398

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/spi/spi-geni-qcom.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index f7d905d2a90f..4e83cc5b445d 100644
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -898,11 +898,8 @@ static int spi_geni_probe(struct platform_device *pdev)
 		return irq;
 
 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
-	if (ret) {
-		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
-		if (ret)
-			return dev_err_probe(dev, ret, "could not set DMA mask\n");
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "could not set DMA mask\n");
 
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
-- 
2.32.0