76 lines
1.9 KiB
Diff
76 lines
1.9 KiB
Diff
From 8585756342caa6d27008d1ad0c18023e4211a40a Mon Sep 17 00:00:00 2001
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From: OpenWrt community <openwrt-devel@lists.openwrt.org>
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Date: Wed, 13 Jul 2022 12:22:48 +0200
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Subject: [PATCH] of/of_net: write back netdev MAC-address to device-tree
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The label-mac logic relies on the mac-address property of a netdev
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devices of-node. However, the mac address can also be stored as a
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different property or read from e.g. an mtd device.
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Create this node when reading a mac-address from OF if it does not
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already exist and copy the mac-address used for the device to this
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property. This way, the MAC address can be accessed using procfs.
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---
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net/core/of_net.c | 22 ++++++++++++++++++++++
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1 file changed, 22 insertions(+)
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--- a/net/core/of_net.c
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+++ b/net/core/of_net.c
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@@ -95,6 +95,27 @@ static int of_get_mac_addr_nvmem(struct
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}
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EXPORT_SYMBOL(of_get_mac_address_nvmem);
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+static int of_add_mac_address(struct device_node *np, u8* addr)
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+{
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+ struct property *prop;
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+
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+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
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+ if (!prop)
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+ return -ENOMEM;
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+
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+ prop->name = "mac-address";
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+ prop->length = ETH_ALEN;
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+ prop->value = kmemdup(addr, ETH_ALEN, GFP_KERNEL);
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+ if (!prop->value || of_update_property(np, prop))
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+ goto free;
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+
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+ return 0;
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+free:
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+ kfree(prop->value);
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+ kfree(prop);
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+ return -ENOMEM;
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+}
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+
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/**
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* of_get_mac_address()
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* @np: Caller's Device Node
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@@ -130,17 +151,23 @@ int of_get_mac_address(struct device_nod
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ret = of_get_mac_addr(np, "mac-address", addr);
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if (!ret)
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- return 0;
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+ goto found;
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ret = of_get_mac_addr(np, "local-mac-address", addr);
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if (!ret)
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- return 0;
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+ goto found;
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ret = of_get_mac_addr(np, "address", addr);
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if (!ret)
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- return 0;
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+ goto found;
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- return of_get_mac_address_nvmem(np, addr);
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+ ret = of_get_mac_address_nvmem(np, addr);
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+ if (ret)
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+ return ret;
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+
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+found:
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+ ret = of_add_mac_address(np, addr);
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+ return ret;
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}
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EXPORT_SYMBOL(of_get_mac_address);
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