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

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Message-Id: <1bf2d3660178b0e6f172e5208bc0bd68d31d9268.1642237482.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 15 Jan 2022 10:05:22 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     John Garry <john.garry@...wei.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-scsi@...r.kernel.org
Subject: [PATCH] scsi: hisi_sas: 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://lore.kernel.org/linux-kernel/YL3vSPK5DXTNvgdx@infradead.org/#t

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c  | 3 ---
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 2 --
 2 files changed, 5 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index a05ec7aece5a..2f53a2ee024a 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -2666,9 +2666,6 @@ static struct Scsi_Host *hisi_sas_shost_alloc(struct platform_device *pdev,
 		goto err_out;
 
 	error = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
-	if (error)
-		error = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
-
 	if (error) {
 		dev_err(dev, "No usable DMA addressing method\n");
 		goto err_out;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index a45ef9a5e12e..a01a3a7b706b 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -4695,8 +4695,6 @@ hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_out;
 
 	rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
-	if (rc)
-		rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 	if (rc) {
 		dev_err(dev, "No usable DMA addressing method\n");
 		rc = -ENODEV;
-- 
2.32.0