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

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Message-Id: <23541c28df8d0dcd3663b5dbe0f76af71e70e9cc.1641743855.git.christophe.jaillet@wanadoo.fr>
Date:   Sun,  9 Jan 2022 16:57:50 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        netdev@...r.kernel.org
Subject: [PATCH] hinic: 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/huawei/hinic/hinic_main.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_main.c b/drivers/net/ethernet/huawei/hinic/hinic_main.c
index 1e1b1be86174..05329292d940 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_main.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_main.c
@@ -1392,12 +1392,8 @@ static int hinic_probe(struct pci_dev *pdev,
 
 	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (err) {
-		dev_warn(&pdev->dev, "Couldn't set 64-bit DMA mask\n");
-		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (err) {
-			dev_err(&pdev->dev, "Failed to set DMA mask\n");
-			goto err_dma_mask;
-		}
+		dev_err(&pdev->dev, "Failed to set DMA mask\n");
+		goto err_dma_mask;
 	}
 
 	err = nic_dev_init(pdev);
-- 
2.32.0