linux-kernel - Re: [PATCH] net: macb: add phy-handle support for the macb

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Message-Id: <20160813.115222.443333178659469072.davem@davemloft.net>
Date:	Sat, 13 Aug 2016 11:52:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	appana.durga.rao@...inx.com
Cc:	robh+dt@...nel.org, mark.rutland@....com, nicolas.ferre@...el.com,
	sergio.prado@...abworks.com, gregory.clement@...e-electrons.com,
	narmstrong@...libre.com, michal.simek@...inx.com,
	appanad@...inx.com, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: macb: add phy-handle support for the macb

From: Kedareswara rao Appana <appana.durga.rao@...inx.com>
Date: Sat, 13 Aug 2016 15:31:49 +0530

> @@ -445,7 +445,13 @@ static int macb_mii_init(struct macb *bp)
>  	dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
>  
>  	np = bp->pdev->dev.of_node;
> -	if (np) {
> +	np1 = of_get_parent(bp->phy_node);
> +	if (np1) {
> +		of_node_put(np1);
> +		err = of_mdiobus_register(bp->mii_bus, np1);
> +		if (err)
> +			goto err_out_unregister_bus;
> +	} else if (np) {

I don't know about this, all OF nodes other than the root have a
parent node which is non-NULL.  This parent node can be anything.

Just blinding assuming that any parent node of the phy_node is
what we are looking for, without any other supplementary checks
at all, seems to be asking for trouble at the very least.