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of: net: support NVMEM cells with MAC in text format 

Some NVMEM devices have text based cells. In such cases MAC is stored in
a XX:XX:XX:XX:XX:XX format. Use mac_pton() to parse such data and
support those NVMEM cells. This is required to support e.g. a very
popular U-Boot and its environment variables.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rafał Miłecki 2021-12-23 13:27:47 +01:00 committed by David S. Miller
parent 271d3be1c3
commit 9ed319e411
1 changed files with 21 additions and 10 deletions
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31
net/core/of_net.c
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@ -61,7 +61,7 @@ static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
{
struct platform_device *pdev = of_find_device_by_node(np);
struct nvmem_cell *cell;
const void *mac;
const void *buf;
size_t len;
int ret;
@ -78,21 +78,32 @@ static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
if (IS_ERR(cell))
return PTR_ERR(cell);
mac = nvmem_cell_read(cell, &len);
buf = nvmem_cell_read(cell, &len);
nvmem_cell_put(cell);
if (IS_ERR(mac))
return PTR_ERR(mac);
if (IS_ERR(buf))
return PTR_ERR(buf);
if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
kfree(mac);
return -EINVAL;
ret = 0;
if (len == ETH_ALEN) {
if (is_valid_ether_addr(buf))
memcpy(addr, buf, ETH_ALEN);
else
ret = -EINVAL;
} else if (len == 3 * ETH_ALEN - 1) {
u8 mac[ETH_ALEN];
if (mac_pton(buf, mac))
memcpy(addr, mac, ETH_ALEN);
else
ret = -EINVAL;
} else {
ret = -EINVAL;
}
memcpy(addr, mac, ETH_ALEN);
kfree(mac);
kfree(buf);
return 0;
return ret;
}
/**