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From 8585756342caa6d27008d1ad0c18023e4211a40a Mon Sep 17 00:00:00 2001
From: OpenWrt community <openwrt-devel@lists.openwrt.org>
Date: Wed, 13 Jul 2022 12:22:48 +0200
Subject: [PATCH] of/of_net: write back netdev MAC-address to device-tree
The label-mac logic relies on the mac-address property of a netdev
devices of-node. However, the mac address can also be stored as a
different property or read from e.g. an mtd device.
Create this node when reading a mac-address from OF if it does not
already exist and copy the mac-address used for the device to this
property. This way, the MAC address can be accessed using procfs.
---
net/core/of_net.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/net/core/of_net.c b/net/core/of_net.c
index 71c38b532f72..43b28c8ddff9 100644
--- a/net/core/of_net.c
+++ b/net/core/of_net.c
@@ -95,6 +95,27 @@ static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
return 0;
}
+static int of_add_mac_address(struct device_node *np, u8* addr)
+{
+ struct property *prop;
+
+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+ if (!prop)
+ return -ENOMEM;
+
+ prop->name = "mac-address";
+ prop->length = ETH_ALEN;
+ prop->value = kmemdup(addr, ETH_ALEN, GFP_KERNEL);
+ if (!prop->value || of_update_property(np, prop))
+ goto free;
+
+ return 0;
+free:
+ kfree(prop->value);
+ kfree(prop);
+ return -ENOMEM;
+}
+
/**
* of_get_mac_address()
* @np: Caller's Device Node
@@ -175,6 +196,7 @@ int of_get_mac_address(struct device_node *np, u8 *addr)
addr[5] = (mac_val >> 0) & 0xff;
}
+ of_add_mac_address(np, addr);
return ret;
}
EXPORT_SYMBOL(of_get_mac_address);
--
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