linux-kernel - Re: [v2] ethernet: ti: eliminate a bit of duplicate code in gbe

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Date:   Wed, 10 Apr 2019 09:56:34 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Wen Yang <wen.yang99@....com.cn>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Yi Wang <wang.yi59@....com.cn>,
        Wingman Kwok <w-kwok2@...com>,
        Murali Karicheri <m-karicheri2@...com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [v2] ethernet: ti: eliminate a bit of duplicate code in
 gbe_probe()

> v2: Massaged changelog a bit

* How does this wording fit to the adjusted commit subject?

* Would it have been nicer to send this version as a direct reply
  to the previous update suggestion?


> @@ -3651,22 +3651,18 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
>  	if (ret)
>  		return ret;
>
> -	interfaces = of_get_child_by_name(node, "interfaces");
> -	if (!interfaces)
> -		dev_err(dev, "could not find interfaces\n");
> -

How do you think about to skip a bit of statements as a reaction for
such a null pointer?
https://elixir.bootlin.com/linux/v5.1-rc4/source/drivers/net/ethernet/ti/netcp_ethss.c#L3562


>  	ret = netcp_txpipe_init(&gbe_dev->tx_pipe, netcp_device,
>  				gbe_dev->dma_chan_name, gbe_dev->tx_queue_id);
> -	if (ret) {
> -		of_node_put(interfaces);
> +	if (ret)
>  		return ret;
> -	}
>
>  	ret = netcp_txpipe_open(&gbe_dev->tx_pipe);
> -	if (ret) {
> -		of_node_put(interfaces);
> +	if (ret)
>  		return ret;
> -	}
> +
> +	interfaces = of_get_child_by_name(node, "interfaces");
> +	if (!interfaces)
> +		dev_err(dev, "could not find interfaces\n");
>
>  	/* Create network interfaces */
>  	INIT_LIST_HEAD(&gbe_dev->gbe_intf_head);

Can code like the following trigger corresponding software development concerns?

	for_each_child_of_node(interfaces, interface) {
…
	}
	of_node_put(interfaces);

	if (!gbe_dev->num_slaves)
		dev_warn(dev, "No network interface configured\n");


Regards,
Markus