netdev - Re: [PATCH net v3] net: dsa: mt7530: fix impossible MDIO address and issue warning

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Message-ID: <20240703191308.3703099c@kernel.org>
Date: Wed, 3 Jul 2024 19:13:08 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>
Cc: Arınç ÜNAL <arinc.unal@...nc9.com>, DENG Qingfang
 <dqfext@...il.com>, Sean Wang <sean.wang@...iatek.com>, Andrew Lunn
 <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean
 <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Matthias Brugger
 <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, Landen Chao
 <Landen.Chao@...iatek.com>, Frank Wunderlich <linux@...web.de>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 regressions@...ts.linux.dev
Subject: Re: [PATCH net v3] net: dsa: mt7530: fix impossible MDIO address
 and issue warning

On Wed, 3 Jul 2024 00:44:28 +0100 Daniel Golle wrote:
> +	/* The corrected address is calculated as stated below:
> +	 * 0~6   -> 31
> +	 * 8~14  -> 7
> +	 * 16~22 -> 15
> +	 * 24~30 -> 23
> +	 */
> +return ((((phy_addr - MT7530_NUM_PORTS) & ~MT7530_NUM_PORTS) % PHY_MAX_ADDR) +
> +	MT7530_NUM_PORTS) & (PHY_MAX_ADDR - 1);

nit: the return statement lacks indentation

but also based on the comment, isn't it:

	return (round_down(phy_addr, MT7530_NUM_PORTS + 1) - 1)	& (PHY_MAX_ADDR - 1);

?
-- 
pw-bot: cr