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

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Message-Id: <20220318010018.2142089-1-chi.minghao@zte.com.cn>
Date:   Fri, 18 Mar 2022 01:00:18 +0000
From:   cgel.zte@...il.com
To:     brking@...ibm.com
Cc:     jejb@...ux.ibm.com, 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: ipr: 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/ipr.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 104bee9b3a9d..dd8b32b00c9b 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -10261,11 +10261,8 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
 
 	if (ioa_cfg->sis64) {
 		rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
-		if (rc < 0) {
+		if (rc < 0)
 			dev_dbg(&pdev->dev, "Failed to set 64 bit DMA mask\n");
-			rc = dma_set_mask_and_coherent(&pdev->dev,
-						       DMA_BIT_MASK(32));
-		}
 	} else
 		rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 
-- 
2.25.1