target/linux/bcm4908/patches-5.4/078-v6.1-0001-net-broadcom-bcm4908_enet-handle-EPROBE_DEFER-when-g.patch

From e93a766da57fff3273bcb618edf5dfca1fb86b89 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Thu, 15 Sep 2022 15:30:13 +0200
Subject: [PATCH] net: broadcom: bcm4908_enet: handle -EPROBE_DEFER when
 getting MAC
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Reading MAC from OF may return -EPROBE_DEFER if underlaying NVMEM device
isn't ready yet. In such case pass that error code up and "wait" to be
probed later.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20220915133013.2243-1-zajec5@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/broadcom/bcm4908_enet.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -714,10 +714,14 @@ static int bcm4908_enet_probe(struct pla
 
 	SET_NETDEV_DEV(netdev, &pdev->dev);
 	mac = of_get_mac_address(dev->of_node);
-	if (!IS_ERR(mac))
+	if (!IS_ERR(mac)) {
 		ether_addr_copy(netdev->dev_addr, mac);
-	else
+	} else if (PTR_ERR(mac) == -EPROBE_DEFER) {
+		err = -EPROBE_DEFER;
+		goto err_dma_free;
+	} else {
 		eth_hw_addr_random(netdev);
+	}
 	netdev->netdev_ops = &bcm4908_enet_netdev_ops;
 	netdev->min_mtu = ETH_ZLEN;
 	netdev->mtu = ETH_DATA_LEN;
@@ -726,14 +730,17 @@ static int bcm4908_enet_probe(struct pla
 	netif_napi_add(netdev, &enet->rx_ring.napi, bcm4908_enet_poll_rx, NAPI_POLL_WEIGHT);
 
 	err = register_netdev(netdev);
-	if (err) {
-		bcm4908_enet_dma_free(enet);
-		return err;
-	}
+	if (err)
+		goto err_dma_free;
 
 	platform_set_drvdata(pdev, enet);
 
 	return 0;
+
+err_dma_free:
+	bcm4908_enet_dma_free(enet);
+
+	return err;
 }
 
 static int bcm4908_enet_remove(struct platform_device *pdev)