target/linux/generic/pending-5.10/683-of_net-add-mac-address-to-of-tree.patch

   1 From: David Bauer <mail@david-bauer.net>
   2 Subject: of/net: Add MAC address to of tree
   3
   4 The label-mac logic relies on the mac-address property of a netdev
   5 devices of-node. However, the mac address can also be stored as a
   6 different property or read from e.g. an mtd device.
   7
   8 Create this node when reading a mac-address from OF if it does not
   9 already exist and copy the mac-address used for the device to this
  10 property. This way, the MAC address can be accessed using procfs.
  11
  12 Submitted-by: David Bauer <mail@david-bauer.net>
  13 ---
  14  drivers/of/of_net.c                           | 22 ++++++++++++++
  15  1 files changed, 22 insertions(+)
  16
  17 --- a/drivers/of/of_net.c
  18 +++ b/drivers/of/of_net.c
  19 @@ -95,6 +95,27 @@ static int of_get_mac_addr_nvmem(struct
  20         return 0;
  21  }
  22
  23 +static int of_add_mac_address(struct device_node *np, u8* addr)
  24 +{
  25 +       struct property *prop;
  26 +
  27 +       prop = kzalloc(sizeof(*prop), GFP_KERNEL);
  28 +       if (!prop)
  29 +               return -ENOMEM;
  30 +
  31 +       prop->name = "mac-address";
  32 +       prop->length = ETH_ALEN;
  33 +       prop->value = kmemdup(addr, ETH_ALEN, GFP_KERNEL);
  34 +       if (!prop->value || of_update_property(np, prop))
  35 +               goto free;
  36 +
  37 +       return 0;
  38 +free:
  39 +       kfree(prop->value);
  40 +       kfree(prop);
  41 +       return -ENOMEM;
  42 +}
  43 +
  44  /**
  45   * Search the device tree for the best MAC address to use.  'mac-address' is
  46   * checked first, because that is supposed to contain to "most recent" MAC
  47 @@ -171,6 +192,7 @@ found:
  48                 addr[5] = (mac_val >> 0) & 0xff;
  49         }
  50
  51 +       of_add_mac_address(np, addr);
  52         return ret;
  53  }
  54  EXPORT_SYMBOL(of_get_mac_address);