net: broadcom: bcm4908_enet: handle -EPROBE_DEFER when getting MAC

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>

diff --git a/drivers/net/ethernet/broadcom/bcm4908_enet.c b/drivers/net/ethernet/broadcom/bcm4908_enet.c
index e5e17a1..489367f 100644 (file)
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -716,6 +716,8 @@ static int bcm4908_enet_probe(struct platform_device *pdev)
 
        SET_NETDEV_DEV(netdev, &pdev->dev);
        err = of_get_ethdev_address(dev->of_node, netdev);
+       if (err == -EPROBE_DEFER)
+               goto err_dma_free;
        if (err)
                eth_hw_addr_random(netdev);
        netdev->netdev_ops = &bcm4908_enet_netdev_ops;
@@ -726,14 +728,17 @@ static int bcm4908_enet_probe(struct platform_device *pdev)
        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)