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Date:   Wed, 29 Mar 2023 19:33:17 +0100
From:   Daniel Golle <daniel@makrotopia.org>
To:     Andrew Lunn <andrew@lunn.ch>
Cc:     netdev@vger.kernel.org, linux-mediatek@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Florian Fainelli <f.fainelli@gmail.com>,
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        "David S. Miller" <davem@davemloft.net>,
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        Jakub Kicinski <kuba@kernel.org>,
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        Matthias Brugger <matthias.bgg@gmail.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Sean Wang <sean.wang@mediatek.com>,
        Landen Chao <Landen.Chao@mediatek.com>,
        DENG Qingfang <dqfext@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Sam Shih <Sam.Shih@mediatek.com>,
        Lorenzo Bianconi <lorenzo@kernel.org>,
        John Crispin <john@phrozen.org>, Felix Fietkau <nbd@nbd.name>
Subject: Re: [RFC PATCH net-next v3 03/15] net: dsa: mt7530: use regmap to
 access switch register space
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On Wed, Mar 29, 2023 at 06:24:21PM +0200, Andrew Lunn wrote:
> Thanks for splitting this patchset up. This is much easier to review.
> 
> > +static u32
> > +mt7530_mii_read(struct mt7530_priv *priv, u32 reg)
> > +{
> > +	int ret;
> > +	u32 val;
> > +
> > +	ret = regmap_read(priv->regmap, reg, &val);
> > +	if (ret) {
> > +		dev_err(priv->dev,
> > +			"failed to read mt7530 register\n");
> > +		return ret;
> 
> This is a u32 function. ret should be negative on error, which is
> going to be turned positive in order to return a u32. So you probably
> want to make this an int function.

This is a pre-existing flaw in the code. As we are accessing 32-bit
registers there has just never been any meaningful error handling.
I guess the correct solution would be to not use the return value only
to indicate success or error, and use an additional u32* parameter for
the read value.

However, I was hestitating to convert all the calls (they are many) to
follow that improved paradigm.

Should I?