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

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Date:   Thu, 17 Mar 2022 07:03:14 +0000
From:   cgel.zte@...il.com
To:     jejb@...ux.ibm.com
Cc:     martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] scsi: csiostor: 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 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://lore.kernel.org/linux-kernel/YL3vSPK5DXTNvgdx@infradead.org/#t

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

diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
index ccbded3353bd..d44cd6da8cb4 100644
--- a/drivers/scsi/csiostor/csio_init.c
+++ b/drivers/scsi/csiostor/csio_init.c
@@ -204,8 +204,6 @@ csio_pci_init(struct pci_dev *pdev, int *bars)
 	pci_try_set_mwi(pdev);
 
 	rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
-	if (rv)
-		rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 	if (rv) {
 		rv = -ENODEV;
 		dev_err(&pdev->dev, "No suitable DMA available.\n");
-- 
2.25.1