linux-kernel - [PATCH v3] net: bcm4908: Handle dma_set_coherent

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Message-Id: <20211203033106.1512770-1-jiasheng@iscas.ac.cn>
Date:   Fri,  3 Dec 2021 11:31:06 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     rafal@...ecki.pl, bcm-kernel-feedback-list@...adcom.com,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org, fw@...len.de,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v3] net: bcm4908: Handle dma_set_coherent_mask error codes

The return value of dma_set_coherent_mask() is not always 0.
To catch the exception in case that dma is not support the mask.

Fixes: 9d61d138ab30 ("net: broadcom: rename BCM4908 driver & update DT binding")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog
 
v2 -> v3
 
* Change 1. Modify the subject.
---
 drivers/net/ethernet/broadcom/bcm4908_enet.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bcm4908_enet.c b/drivers/net/ethernet/broadcom/bcm4908_enet.c
index 02a569500234..376f81796a29 100644
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -708,7 +708,9 @@ static int bcm4908_enet_probe(struct platform_device *pdev)
 
 	enet->irq_tx = platform_get_irq_byname(pdev, "tx");
 
-	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	err = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	if (err)
+		return err;
 
 	err = bcm4908_enet_dma_alloc(enet);
 	if (err)
-- 
2.25.1