linux-kernel - [PATCH] net: enetc: Remove useless DMA-32 fallback configuration

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Message-Id: <dbecd4eb49a9586ee343b5473dda4b84c42112e9.1641742884.git.christophe.jaillet@wanadoo.fr>
Date:   Sun,  9 Jan 2022 16:41:43 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Claudiu Manoil <claudiu.manoil@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Yangbo Lu <yangbo.lu@....com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        netdev@...r.kernel.org
Subject: [PATCH] net: enetc: Remove useless DMA-32 fallback configuration

As stated in [1], dma_set_mask() with a 64-bit mask never fails 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/net/ethernet/freescale/enetc/enetc.c     | 8 ++------
 drivers/net/ethernet/freescale/enetc/enetc_ptp.c | 9 ++-------
 2 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index eacb41f86bdb..d6930a797c6c 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -2897,12 +2897,8 @@ int enetc_pci_probe(struct pci_dev *pdev, const char *name, int sizeof_priv)
 	/* set up for high or low dma */
 	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (err) {
-		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (err) {
-			dev_err(&pdev->dev,
-				"DMA configuration failed: 0x%x\n", err);
-			goto err_dma;
-		}
+		dev_err(&pdev->dev, "DMA configuration failed: 0x%x\n", err);
+		goto err_dma;
 	}
 
 	err = pci_request_mem_regions(pdev, name);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ptp.c b/drivers/net/ethernet/freescale/enetc/enetc_ptp.c
index 36b4f51dd297..17c097cef7d4 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_ptp.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_ptp.c
@@ -42,15 +42,10 @@ static int enetc_ptp_probe(struct pci_dev *pdev,
 	if (err)
 		return dev_err_probe(&pdev->dev, err, "device enable failed\n");
 
-	/* set up for high or low dma */
 	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (err) {
-		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (err) {
-			dev_err(&pdev->dev,
-				"DMA configuration failed: 0x%x\n", err);
-			goto err_dma;
-		}
+		dev_err(&pdev->dev, "DMA configuration failed: 0x%x\n", err);
+		goto err_dma;
 	}
 
 	err = pci_request_mem_regions(pdev, KBUILD_MODNAME);
-- 
2.32.0