netdev - [PATCH net 1/5] of_net: remove nvmem-mac-address property

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Date:   Fri, 10 May 2019 11:35:14 +0200
From:   Petr Štetiar <ynezz@...e.cz>
To:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     Rob Herring <robh@...nel.org>,
        Petr Štetiar <ynezz@...e.cz>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net 1/5] of_net: remove nvmem-mac-address property

In commit d01f449c008a ("of_net: add NVMEM support to
of_get_mac_address") I've added `nvmem-mac-address` property which was
wrong idea as I've allocated the property with devm_kzalloc and then
added it to DT, so then 2 entities would be refcounting the allocation.
So if the driver unbinds, the buffer is freed, but DT code would be
still referencing that memory.

I'm removing this property completely instead of fixing it, as it's not
needed to have it.

Fixes: d01f449c008a ("of_net: add NVMEM support to of_get_mac_address")
Suggested-by: Rob Herring <robh@...nel.org>
Signed-off-by: Petr Štetiar <ynezz@...e.cz>
---
 drivers/of/of_net.c | 29 ++++++-----------------------
 1 file changed, 6 insertions(+), 23 deletions(-)

diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
index 9649cd53e955..a4b392a5406b 100644
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -52,39 +52,22 @@ static const void *of_get_mac_addr(struct device_node *np, const char *name)
 static const void *of_get_mac_addr_nvmem(struct device_node *np)
 {
 	int ret;
-	u8 mac[ETH_ALEN];
-	struct property *pp;
+	const void *mac;
+	u8 nvmem_mac[ETH_ALEN];
 	struct platform_device *pdev = of_find_device_by_node(np);
 
 	if (!pdev)
 		return ERR_PTR(-ENODEV);
 
-	ret = nvmem_get_mac_address(&pdev->dev, &mac);
+	ret = nvmem_get_mac_address(&pdev->dev, &nvmem_mac);
 	if (ret)
 		return ERR_PTR(ret);
 
-	pp = devm_kzalloc(&pdev->dev, sizeof(*pp), GFP_KERNEL);
-	if (!pp)
+	mac = devm_kmemdup(&pdev->dev, nvmem_mac, ETH_ALEN, GFP_KERNEL);
+	if (!mac)
 		return ERR_PTR(-ENOMEM);
 
-	pp->name = "nvmem-mac-address";
-	pp->length = ETH_ALEN;
-	pp->value = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
-	if (!pp->value) {
-		ret = -ENOMEM;
-		goto free;
-	}
-
-	ret = of_add_property(np, pp);
-	if (ret)
-		goto free;
-
-	return pp->value;
-free:
-	devm_kfree(&pdev->dev, pp->value);
-	devm_kfree(&pdev->dev, pp);
-
-	return ERR_PTR(ret);
+	return mac;
 }
 
 /**
-- 
1.9.1