linux-kernel - [PATCH net] fsl/man: Inherit parent device and of

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Message-Id: <20170822222447.16754-1-f.fainelli@gmail.com>
Date:   Tue, 22 Aug 2017 15:24:47 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     junote@...look.com, madalin.bucur@....com,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] fsl/man: Inherit parent device and of_node

Junote Cai reported that he was not able to get a DSA setup involving the
Freescale DPAA/FMAN driver to work and narrowed it down to
of_find_net_device_by_node(). This function requires the network device's
device reference to be correctly set which is the case here, though we have
lost any device_node association there.

The problem is that dpaa_eth_add_device() allocates a "dpaa-ethernet" platform
device, and later on dpaa_eth_probe() is called but SET_NETDEV_DEV() won't be
propagating &pdev->dev.of_node properly. Fix this by inherenting both the parent
device and the of_node when dpaa_eth_add_device() creates the platform device.

Fixes: 3933961682a3 ("fsl/fman: Add FMan MAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/ethernet/freescale/fman/mac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fman/mac.c b/drivers/net/ethernet/freescale/fman/mac.c
index 6e67d22fd0d5..1c7da16ad0ff 100644
--- a/drivers/net/ethernet/freescale/fman/mac.c
+++ b/drivers/net/ethernet/freescale/fman/mac.c
@@ -623,6 +623,8 @@ static struct platform_device *dpaa_eth_add_device(int fman_id,
 		goto no_mem;
 	}

+	pdev->dev.of_node = node;
+	pdev->dev.parent = priv->dev;
 	set_dma_ops(&pdev->dev, get_dma_ops(priv->dev));

 	ret = platform_device_add_data(pdev, &data, sizeof(data));
-- 
2.9.3