Re: [PATCHv2 net-next] net: bcmasp: handle EPROBE_DEFER for MAC retrieval

[Justin Chen <justin.chen@broadcom.com>]

On 4/27/26 6:43 PM, Rosen Penev wrote:
> of_get_ethdev_address can return EPROBE_DEFER when using nvmem. To
> handle this, encode the error with ERR_PTR for minimal changes. Adjust
> the only place using bcmasp_interface_create.
> 
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
>   v2: use dev_err_probe.
>   drivers/net/ethernet/broadcom/asp2/bcmasp.c      | 6 +++---
>   drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c | 6 ++++--
>   2 files changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.c b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> index 972474893a6b..e9b11b956344 100644
> --- a/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> +++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> @@ -1333,10 +1333,10 @@ static int bcmasp_probe(struct platform_device *pdev)
>   	i = 0;
>   	for_each_available_child_of_node_scoped(ports_node, intf_node) {
>   		intf = bcmasp_interface_create(priv, intf_node, i);
> -		if (!intf) {
> -			dev_err(dev, "Cannot create eth interface %d\n", i);
> +		if (IS_ERR(intf)) {
>   			of_node_put(ports_node);
> -			ret = -EINVAL;
> +			ret = dev_err_probe(dev, PTR_ERR(intf), "Cannot create eth interface %d\n",
> +					    i);
>   			goto err_cleanup;
>   		}
>   		list_add_tail(&intf->list, &priv->intfs);
> diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
> index ec63f50a849e..caf0e408e2f7 100644
> --- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
> +++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
> @@ -1254,7 +1254,7 @@ struct bcmasp_intf *bcmasp_interface_create(struct bcmasp_priv *priv,
>   	struct device *dev = &priv->pdev->dev;
>   	struct bcmasp_intf *intf;
>   	struct net_device *ndev;
> -	int ch, port, ret;
> +	int ch, port, ret = -EINVAL;
>   
>   	if (of_property_read_u32(ndev_dn, "reg", &port)) {
>   		dev_warn(dev, "%s: invalid port number\n", ndev_dn->name);
> @@ -1314,6 +1314,8 @@ struct bcmasp_intf *bcmasp_interface_create(struct bcmasp_priv *priv,
>   	}
>   
>   	ret = of_get_ethdev_address(ndev_dn, ndev);
> +	if (ret == -EPROBE_DEFER)
> +		return ERR_PTR(-EPROBE_DEFER);

Do we need to hit unwind here? i.e. goto err_deregister_fixed_link.

Thanks,
Justin

>   	if (ret) {
>   		netdev_warn(ndev, "using random Ethernet MAC\n");
>   		eth_hw_addr_random(ndev);
> @@ -1340,7 +1342,7 @@ struct bcmasp_intf *bcmasp_interface_create(struct bcmasp_priv *priv,
>   err_free_netdev:
>   	free_netdev(ndev);
>   err:
> -	return NULL;
> +	return ERR_PTR(ret);
>   }
>   
>   void bcmasp_interface_destroy(struct bcmasp_intf *intf)