linux-kernel - [PATCH 5.15 052/171] net: bcm4908: Handle dma_set_coherent

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Date:   Mon, 13 Dec 2021 10:29:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.15 052/171] net: bcm4908: Handle dma_set_coherent_mask error codes

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

commit 128f6ec95a282b2d8bc1041e59bf65810703fa44 upstream.

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>
Acked-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/broadcom/bcm4908_enet.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 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 pla
 
 	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)