netdev - [PATCH net-next 04/10] i40e: Remove useless DMA-32 fallback configuration

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Message-Id: <20220127215224.422113-5-anthony.l.nguyen@intel.com>
Date:   Thu, 27 Jan 2022 13:52:18 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
        sassmann@...hat.com, Christoph Hellwig <hch@....de>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Gurucharan G <gurucharanx.g@...el.com>
Subject: [PATCH net-next 04/10] i40e: Remove useless DMA-32 fallback configuration

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

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>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Alexander Lobakin <alexandr.lobakin@...el.com>
Tested-by: Gurucharan G <gurucharanx.g@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index f70c478dafdb..c8834765c864 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -15322,12 +15322,9 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* 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;
 	}
 
 	/* set up pci connections */
-- 
2.31.1