linux-kernel - Re: [PATCH 1/2] stmmac: fix pcs

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Message-ID: <ZICQMHTowGQTzbxm@shell.armlinux.org.uk>
Date:   Wed, 7 Jun 2023 15:12:00 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Simon Horman <simon.horman@...igine.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Arnd Bergmann <arnd@...db.de>,
        Christian Marangi <ansuelsmth@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Bhadram Varka <vbhadram@...dia.com>,
        Samin Guo <samin.guo@...rfivetech.com>, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] stmmac: fix pcs_lynx link failure

On Wed, Jun 07, 2023 at 03:56:32PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The mdio code in stmmac now directly links into both the lynx_pcs and
> the xpcs device drivers, but the lynx_pcs dependency is only enforced
> for the altera variant of stmmac, which is the one that actually uses it.
> 
> Building stmmac for a non-altera platform therefore causes a link
> failure:
> 
> arm-linux-gnueabi-ld: drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.o: in function `stmmac_mdio_unregister':
> stmmac_mdio.c:(.text+0x1418): undefined reference to `lynx_pcs_destroy'
> 
> I've tried to come up with a patch that moves this dependency back into
> the dwmac-socfpga.c file, but there was no easy and obvious way to
> do this. It also seems that this would not be a proper solution, but
> instead there should be a real abstraction for pcs drivers that lets
> device drivers handle this transparently.

There is already a patch set on netdev fixing this properly.

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