linux-kernel - Re: [PATCH 2/2] net: phy: adin1100: Simplify register value passing

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Message-ID: <aR3EM0OK09bvCT0B@shell.armlinux.org.uk>
Date: Wed, 19 Nov 2025 13:20:51 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Alexander Dahl <ada@...rsis.com>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: phy: adin1100: Simplify register value passing

On Wed, Nov 19, 2025 at 01:47:37PM +0100, Alexander Dahl wrote:
> The additional use case for that variable is gone,
> the expression is simple enough to pass it inline now.

Looking at net-next, this patch is wrong. You remove "val" but the code
after the context in this patch is:

        return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1, ADIN_CRSM_STAT, ret,
                                         (ret & ADIN_CRSM_SFT_PD_RDY) == val,
                                         1000, 30000, true);

which also references "val".

Note that this code is buggy as things stand. "val" will be zero (when
en is false) or 1 (when en is true), whereas ADIN_CRSM_SFT_PD_RDY is 2.
Thus, if en is true, then the condition can never be true.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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