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From: David Bauer <mail@david-bauer.net>
Date: Tue, 20 Jul 2021 22:00:10 +0200
Subject: [PATCH] generic: add mac-address property for NVMEM mac addresses
Traversing the device-tree by referencing a network device to determine
a devices labe-mac does not work with the generic nvmem implementation,
as the userspace expects the MAC-address to be available as a
device-tree property.
The legacy mtd-mac-address implementation did create such a node. Do the
same when using the nvmem implementation to allow reading the MAC
address.
Fixes commit d284e6ef0f06 ("treewide: convert mtd-mac-address-increment*
to generic implementation")
Signed-off-by: David Bauer <mail@david-bauer.net>
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -55,6 +55,7 @@ static void *of_get_mac_addr_nvmem(struc
void *mac;
u8 nvmem_mac[ETH_ALEN];
struct platform_device *pdev = of_find_device_by_node(np);
+ struct property *prop;
if (!pdev) {
*err = -ENODEV;
@@ -72,10 +73,29 @@ static void *of_get_mac_addr_nvmem(struc
put_device(&pdev->dev);
if (!mac) {
*err = -ENOMEM;
- return NULL;
+ goto out_err;
+ }
+
+ prop = devm_kzalloc(&pdev->dev, sizeof(*prop), GFP_KERNEL);
+ if (!prop) {
+ *err = -ENOMEM;
+ goto out_err;
+ }
+ prop->name = "mac-address";
+ prop->length = ETH_ALEN;
+ prop->value = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
+ if (!prop->value || of_add_property(np, prop)) {
+ *err = -ENOMEM;
+ goto out_err;
}
return mac;
+
+out_err:
+ devm_kfree(&pdev->dev, prop->value);
+ devm_kfree(&pdev->dev, prop);
+ devm_kfree(&pdev->dev, mac);
+ return NULL;
}
static void *of_get_mac_address_mtd(struct device_node *np)
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