linux-kernel - Re: [PATCH net 11/16] net: ethernet: marvell: mvneta: fix fixed-link phydev leaks

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Message-ID: <20200508062119.GE25962@localhost>
Date:   Fri, 8 May 2020 08:21:19 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        linux- stable <stable@...r.kernel.org>,
        Sasha Levin <sashal@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Fugang Duan <fugang.duan@....com>,
        Pantelis Antoniou <pantelis.antoniou@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Lars Persson <lars.persson@...s.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Netdev <netdev@...r.kernel.org>,
        nios2-dev@...ts.rocketboards.org,
        open list <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-mediatek@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org, linux-omap@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, lkft-triage@...ts.linaro.org
Subject: Re: [PATCH net 11/16] net: ethernet: marvell: mvneta: fix fixed-link
 phydev leaks

On Fri, May 08, 2020 at 03:35:02AM +0530, Naresh Kamboju wrote:
> On Thu, 7 May 2020 at 16:43, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> <trim>
> > > >
> > > > Greg, 3f65047c853a ("of_mdio: add helper to deregister fixed-link
> > > > PHYs") needs to be backported as well for these.
> > > >
> > > > Original series can be found here:
> > > >
> > > >     https://lkml.kernel.org/r/1480357509-28074-1-git-send-email-johan@kernel.org
> > >
> > > Ah, thanks for that, I thought I dropped all of the ones that caused
> > > build errors, but missed the above one.  I'll go take the whole series
> > > instead.
> >
> > This should now all be fixed up, thanks.
> 
> While building kernel Image for arm architecture on stable-rc 4.4 branch
> the following build error found.
> 
> of_mdio: add helper to deregister fixed-link PHYs
> commit 3f65047c853a2a5abcd8ac1984af3452b5df4ada upstream.
> 
> Add helper to deregister fixed-link PHYs registered using
> of_phy_register_fixed_link().
> 
> Convert the two drivers that care to deregister their fixed-link PHYs to
> use the new helper, but note that most drivers currently fail to do so.
> 
> Signed-off-by: Johan Hovold <johan@...nel.org>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> [only take helper function for 4.4.y - gregkh]
> 
>  # make -sk KBUILD_BUILD_USER=TuxBuild -C/linux -j16 ARCH=arm
> CROSS_COMPILE=arm-linux-gnueabihf- HOSTCC=gcc CC="sccache
> arm-linux-gnueabihf-gcc" O=build zImage
> 70 #
> 71 ../drivers/of/of_mdio.c: In function ‘of_phy_deregister_fixed_link’:
> 72 ../drivers/of/of_mdio.c:379:2: error: implicit declaration of
> function ‘fixed_phy_unregister’; did you mean ‘fixed_phy_register’?
> [-Werror=implicit-function-declaration]
> 73  379 | fixed_phy_unregister(phydev);
> 74  | ^~~~~~~~~~~~~~~~~~~~
> 75  | fixed_phy_register
> 76 ../drivers/of/of_mdio.c:381:22: error: ‘struct phy_device’ has no
> member named ‘mdio’; did you mean ‘mdix’?
> 77  381 | put_device(&phydev->mdio.dev); /* of_phy_find_device() */
> 78  | ^~~~
> 79  | mdix

Another dependency: 5bcbe0f35fb1 ("phy: fixed: Fix removal of phys.")

Greg, these patches are from four years ago so can't really remember if
there are other dependencies or reasons against backporting them (the
missing stable tags are per Dave's preference), sorry.

The cover letter also mentions another dependency, but that may just
have been some context conflict.

Perhaps you better drop these unless you want to review them closer.

Johan