Patch "net: ethernet: mtk_eth_soc: handle probe deferral" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    net: ethernet: mtk_eth_soc: handle probe deferral

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-ethernet-mtk_eth_soc-handle-probe-deferral.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b23396ba46fea961466d9c753063ef3f69673c03
Author: Daniel Golle <daniel@xxxxxxxxxxxxxx>
Date:   Thu Jul 13 03:42:29 2023 +0100

    net: ethernet: mtk_eth_soc: handle probe deferral
    
    [ Upstream commit 1d6d537dc55d1f42d16290f00157ac387985b95b ]
    
    Move the call to of_get_ethdev_address to mtk_add_mac which is part of
    the probe function and can hence itself return -EPROBE_DEFER should
    of_get_ethdev_address return -EPROBE_DEFER. This allows us to entirely
    get rid of the mtk_init function.
    
    The problem of of_get_ethdev_address returning -EPROBE_DEFER surfaced
    in situations in which the NVMEM provider holding the MAC address has
    not yet be loaded at the time mtk_eth_soc is initially probed. In this
    case probing of mtk_eth_soc should be deferred instead of falling back
    to use a random MAC address, so once the NVMEM provider becomes
    available probing can be repeated.
    
    Fixes: 656e705243fd ("net-next: mediatek: add support for MT7623 ethernet")
    Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index c55ba1d085e5b..50ee9d3d4c841 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2612,23 +2612,6 @@ static int mtk_hw_deinit(struct mtk_eth *eth)
 	return 0;
 }
 
-static int __init mtk_init(struct net_device *dev)
-{
-	struct mtk_mac *mac = netdev_priv(dev);
-	struct mtk_eth *eth = mac->hw;
-	int ret;
-
-	ret = of_get_ethdev_address(mac->of_node, dev);
-	if (ret) {
-		/* If the mac address is invalid, use random mac address */
-		eth_hw_addr_random(dev);
-		dev_err(eth->dev, "generated random MAC address %pM\n",
-			dev->dev_addr);
-	}
-
-	return 0;
-}
-
 static void mtk_uninit(struct net_device *dev)
 {
 	struct mtk_mac *mac = netdev_priv(dev);
@@ -2956,7 +2939,6 @@ static const struct ethtool_ops mtk_ethtool_ops = {
 };
 
 static const struct net_device_ops mtk_netdev_ops = {
-	.ndo_init		= mtk_init,
 	.ndo_uninit		= mtk_uninit,
 	.ndo_open		= mtk_open,
 	.ndo_stop		= mtk_stop,
@@ -3010,6 +2992,17 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 	mac->hw = eth;
 	mac->of_node = np;
 
+	err = of_get_ethdev_address(mac->of_node, eth->netdev[id]);
+	if (err == -EPROBE_DEFER)
+		return err;
+
+	if (err) {
+		/* If the mac address is invalid, use random mac address */
+		eth_hw_addr_random(eth->netdev[id]);
+		dev_err(eth->dev, "generated random MAC address %pM\n",
+			eth->netdev[id]->dev_addr);
+	}
+
 	memset(mac->hwlro_ip, 0, sizeof(mac->hwlro_ip));
 	mac->hwlro_ip_cnt = 0;