linux-kernel - [PATCH] net: macb: Check return value of dma_set_mask_and

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Message-ID: <20250526032034.84900-1-sperezglz@gmail.com>
Date: Sun, 25 May 2025 21:20:31 -0600
From: Sergio Perez Gonzalez <sperezglz@...il.com>
To: nicolas.ferre@...rochip.com,
	claudiu.beznea@...on.dev
Cc: Sergio Perez Gonzalez <sperezglz@...il.com>,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	shuah@...nel.org
Subject: [PATCH] net: macb: Check return value of dma_set_mask_and_coherent()

Issue flagged by coverity. Add a safety check for the return value
of dma_set_mask_and_coherent, go to a safe exit if it returns error.

Link: https://scan7.scan.coverity.com/#/project-view/53936/11354?selectedIssue=1643754

Signed-off-by: Sergio Perez Gonzalez <sperezglz@...il.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index e1e8bd2ec155..d1f1ae5ea161 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -5283,7 +5283,11 @@ static int macb_probe(struct platform_device *pdev)
 
 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 	if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) {
-		dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
+		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
+		if (err) {
+			dev_err(&pdev->dev, "failed to set DMA mask\n");
+			goto err_out_free_netdev;
+		}
 		bp->hw_dma_cap |= HW_DMA_CAP_64B;
 	}
 #endif
-- 
2.43.0