linux-kernel - [PATCH] HID: amd_sfh: Remove useless DMA-32 fallback configuration

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Message-Id: <a1ce59490a9a32f638a41fb80ff4b4598c33acec.1642260273.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 15 Jan 2022 16:24:50 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Nehal Shah <nehal-bakulchandra.shah@....com>,
        Basavaraj Natikar <basavaraj.natikar@....com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-input@...r.kernel.org
Subject: [PATCH] HID: amd_sfh: 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/hid/amd-sfh-hid/amd_sfh_pcie.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
index 2503be0253d3..673536d1d9ba 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
@@ -248,11 +248,8 @@ static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *i
 	pci_set_master(pdev);
 	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(&pdev->dev, "failed to set DMA mask\n");
-			return rc;
-		}
+		dev_err(&pdev->dev, "failed to set DMA mask\n");
+		return rc;
 	}
 
 	privdata->cl_data = devm_kzalloc(&pdev->dev, sizeof(struct amdtp_cl_data), GFP_KERNEL);
-- 
2.32.0