linux-kernel - Re: [PATCH net-next] net: gianfar: fix NVMEM mac address

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Message-ID: <20240910064441.GH2097826@kernel.org>
Date: Tue, 10 Sep 2024 07:44:41 +0100
From: Simon Horman <horms@...nel.org>
To: Rosen Penev <rosenp@...il.com>
Cc: netdev@...r.kernel.org, andrew@...n.ch, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	linux-kernel@...r.kernel.org, claudiu.manoil@....com,
	mail@...id-bauer.net
Subject: Re: [PATCH net-next] net: gianfar: fix NVMEM mac address

On Mon, Sep 09, 2024 at 12:14:38PM -0700, Rosen Penev wrote:
> On Mon, Sep 9, 2024 at 11:48 AM Simon Horman <horms@...nel.org> wrote:
> >
> > On Mon, Sep 09, 2024 at 11:20:20AM -0700, Rosen Penev wrote:
> > > On Mon, Sep 9, 2024 at 11:11 AM Rosen Penev <rosenp@...il.com> wrote:
> > > >
> > > > On Mon, Sep 9, 2024 at 1:55 AM Simon Horman <horms@...nel.org> wrote:
> > > > >
> > > > > On Sun, Sep 08, 2024 at 02:35:54PM -0700, Rosen Penev wrote:
> > > > > > If nvmem loads after the ethernet driver, mac address assignments will
> > > > > > not take effect. of_get_ethdev_address returns EPROBE_DEFER in such a
> > > > > > case so we need to handle that to avoid eth_hw_addr_random.
> > > > > >
> > > > > > Signed-off-by: Rosen Penev <rosenp@...il.com>
> > > > > > ---
> > > > > >  drivers/net/ethernet/freescale/gianfar.c | 2 ++
> > > > > >  1 file changed, 2 insertions(+)
> > > > > >
> > > > > > diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
> > > > > > index 634049c83ebe..9755ec947029 100644
> > > > > > --- a/drivers/net/ethernet/freescale/gianfar.c
> > > > > > +++ b/drivers/net/ethernet/freescale/gianfar.c
> > > > > > @@ -716,6 +716,8 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
> > > > > >               priv->device_flags |= FSL_GIANFAR_DEV_HAS_BUF_STASHING;
> > > > > >
> > > > > >       err = of_get_ethdev_address(np, dev);
> > > > > > +     if (err == -EPROBE_DEFER)
> > > > > > +             return err;
> > > > >
> > > > > To avoid leaking resources, I think this should be:
> > > > >
> > > > >                 goto err_grp_init;
> > > > will do in v2. Unfortunately net-next closes today AFAIK.
> > > On second thought, where did you find this?
> > >
> > > git grep err_grp_init
> > >
> > > returns nothing.
> > >
> > > Not only that, this function has no goto.
> >
> > Maybe we are looking at different things for some reason.
> Well that's embarrassing. Locally I seem to have a commit that adds a
> bunch of devm and as a result these gotos. Unfortunately I don't have
> the hardware to test those changes. I'll be doing a v2 for when
> net-next opens.

No problem. TBH it is a relief, as I was beginning to doubt my own sanity.

> >
> > I'm looking at this:
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/tree/drivers/net/ethernet/freescale/gianfar.c?id=bfba7bc8b7c2c100b76edb3a646fdce256392129#n814
> >
> > > > >
> > > > > Flagged by Smatch.
> > > > >
> > > > > >       if (err) {
> > > > > >               eth_hw_addr_random(dev);
> > > > > >               dev_info(&ofdev->dev, "Using random MAC address: %pM\n", dev->dev_addr);
> > > > >
> > > > > --
> > > > > pw-bot: cr
> > >
>