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lantiq: xrx200: handle EPROBE_DEFER for MAC address
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The xrx200 ethernet driver falls back to a random MAC address on any
error from of_get_ethdev_address(), including -EPROBE_DEFER. When the
MAC address comes from an nvmem layout driver (such as u-boot-env on
NAND), the nvmem cell may not be available yet at first probe attempt.

Fix this by propagating EPROBE_DEFER so the driver probe is deferred
until the nvmem cell becomes available.

Tested on Zyxel P-2812HNU-F1 (NAND, u-boot-env nvmem layout).

Signed-off-by: Burak Aydos <byhexadecimal@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21861
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Burak Aydos 2026-02-03 23:38:01 +03:00 • committed by Hauke Mehrtens
parent 09de759506
commit 50e7e5c80d
1 changed files with 30 additions and 0 deletions
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target/linux/lantiq/patches-6.12/0801-net-ethernet-lantiq-xrx200-handle-EPROBE_DEFER-for-MAC-address.patch Normal file
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@ -0,0 +1,30 @@
From: Burak Aydos <byhexadecimal@gmail.com>
Date: Mon, 03 Feb 2026 12:00:00 +0300
Subject: [PATCH] net: ethernet: lantiq: xrx200: handle EPROBE_DEFER for MAC
address
When the MAC address is provided by an nvmem layout driver (such as
u-boot-env), the nvmem cell may not be available yet when the ethernet
driver probes. In this case, of_get_ethdev_address() returns
-EPROBE_DEFER to indicate the driver should be retried later.
Currently the driver treats all errors equally and falls back to a
random MAC address. Fix this by propagating EPROBE_DEFER so the
driver probe is deferred until the nvmem cell becomes available.
Signed-off-by: Burak Aydos <byhexadecimal@gmail.com>
---
drivers/net/ethernet/lantiq_xrx200.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/net/ethernet/lantiq_xrx200.c
+++ b/drivers/net/ethernet/lantiq_xrx200.c
@@ -597,6 +597,8 @@ static int xrx200_probe(struct platform_
}
err = of_get_ethdev_address(np, net_dev);
+ if (err == -EPROBE_DEFER)
+ return err;
if (err)
eth_hw_addr_random(net_dev);