net: bgmac-platform: handle mac-address deferral

This patch is a replication of Christian Lamparter's "net: bgmac-bcma:
handle deferred probe error due to mac-address" patch for the
bgmac-platform driver [1].

As is the case with the bgmac-bcma driver, this change is to cover the
scenario where the MAC address cannot yet be discovered due to reliance
on an nvmem provider which is yet to be instantiated, resulting in a
random address being assigned that has to be manually overridden.

[1] https://lore.kernel.org/netdev/20210919115725.29064-1-chunkeey@gmail.com

Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bgmac-platform.c b/drivers/net/ethernet/broadcom/bgmac-platform.c
index 4ab5bf64d353e35761d468c90394cb6a4e05cfd2..df8ff839cc62142cf7b2b94a11b76a5860c6306c 100644 (file)
--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
+++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
@@ -192,6 +192,9 @@ static int bgmac_probe(struct platform_device *pdev)
        bgmac->dma_dev = &pdev->dev;
 
        ret = of_get_mac_address(np, bgmac->net_dev->dev_addr);
+       if (ret == -EPROBE_DEFER)
+               return ret;
+
        if (ret)
                dev_warn(&pdev->dev,
                         "MAC address not present in device tree\n");