linux-kernel - Re: [PATCH v2] net: phy: marvell: fix detection of PHY on Topaz switches

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Message-ID: <20210413012507.355bc809@thinkpad>
Date:   Tue, 13 Apr 2021 01:25:06 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: phy: marvell: fix detection of PHY on Topaz
 switches

> +	/* Some internal PHYs don't have a model number. */
> +	if (reg == MII_PHYSID2 && !(val & 0x3f0) &&
> +	    chip->info->family < ARRAY_SIZE(family_prod_id_table)) {
> +		prod_id = family_prod_id_table[chip->info->family];
> +		if (prod_id)
> +			val |= prod_id >> 4;

Isn't if(prod_id) check redundant here? If prod_id is 0, the |=
statement won't do anything.

Marek