linux-kernel - [PATCH] fpga: dfl: pci: Remove useless DMA-32 fallback configuration

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Date:   Fri, 18 Mar 2022 00:59:38 +0000
From:   cgel.zte@...il.com
To:     hao.wu@...el.com
Cc:     trix@...hat.com, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] fpga: dfl: pci: Remove useless DMA-32 fallback configuration

From: Minghao Chi <chi.minghao@....com.cn>

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

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
---
 drivers/fpga/dfl-pci.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
index 717ac9715970..42fdfa7a28d6 100644
--- a/drivers/fpga/dfl-pci.c
+++ b/drivers/fpga/dfl-pci.c
@@ -356,8 +356,6 @@ int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
 	pci_set_master(pcidev);
 
 	ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(64));
-	if (ret)
-		ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32));
 	if (ret) {
 		dev_err(&pcidev->dev, "No suitable DMA support available.\n");
 		goto disable_error_report_exit;
-- 
2.25.1