netdev - Re: [PATCH net-next 2/6] net: mdio: Rework scanning of bus ready for quirks

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Date:   Tue, 17 Jan 2023 17:17:40 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-aspeed@...ts.ozlabs.org, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 2/6] net: mdio: Rework scanning of bus ready
 for quirks

On Mon, 16 Jan 2023 13:55:14 +0100 Michael Walle wrote:
> From: Andrew Lunn <andrew@...n.ch>
> 
> Some C22 PHYs do bad things when there are C45 transactions on the
> bus. In order to handle this, the bus needs to be scanned first for
> C22 at all addresses, and then C45 scanned for all addresses.
> 
> The Marvell pxa168 driver scans a specific address on the bus to find
> its PHY. This is a C22 only device, so update it to use the c22
> helper.

clang says:

drivers/net/phy/mdio_bus.c:708:11: warning: variable 'i' is uninitialized when used here [-Wuninitialized]
        while (--i >= 0) {
                 ^
drivers/net/phy/mdio_bus.c:620:7: note: initialize the variable 'i' to silence this warning
        int i, err;
             ^
              = 0