[PATCHv6 net-next 6/7] net: ibm: emac: generate random MAC if not found

Rosen Penev
2024-10-11T19:56:34Z

On this Cisco MX60W, u-boot sets the local-mac-address property.
Unfortunately by default, the MAC is wrong and is actually located on a
UBI partition. Which means nvmem needs to be used to grab it.

In the case where that fails, EMAC fails to initialize instead of
generating a random MAC as many other drivers do.

Match behavior with other drivers to have a working ethernet interface.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
drivers/net/ethernet/ibm/emac/core.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c
index b9ccaae61c48..faa483790b29 100644
--- a/drivers/net/ethernet/ibm/emac/core.c
+++ b/drivers/net/ethernet/ibm/emac/core.c
@@ -2937,9 +2937,12 @@ static int emac_init_config(struct emac_instance *dev)

/* Read MAC-address */
err = of_get_ethdev_address(np, dev->ndev);
- if (err)
- return dev_err_probe(&dev->ofdev->dev, err,
- "Can't get valid [local-]mac-address from OF !\n");
+ if (err == -EPROBE_DEFER)
+ return err;
+ if (err) {
+ dev_warn(&dev->ofdev->dev, "Can't get valid mac-address. Generating random.");
+ eth_hw_addr_random(dev->ndev);
+ }

/* IAHT and GAHT filter parameterization */
if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
--
2.47.0