netdev - Re: [PATCH] net: dsa: rtl8366: Check VLAN ID and not ports

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Message-ID: <CACRpkdaLTf9x=yTBBcGXDUmu2fNjLhx_eWVce_LQcPCjeq9TcQ@mail.gmail.com>
Date:   Sat, 28 Sep 2019 22:26:08 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: dsa: rtl8366: Check VLAN ID and not ports

On Fri, Sep 27, 2019 at 6:40 PM Florian Fainelli <f.fainelli@...il.com> wrote:
> On 9/27/19 9:39 AM, Linus Walleij wrote:
> > There has been some confusion between the port number and
> > the VLAN ID in this driver. What we need to check for
> > validity is the VLAN ID, nothing else.
> >
> > The current confusion came from assigning a few default
> > VLANs for default routing and we need to rewrite that
> > properly.
> >
> > Instead of checking if the port number is a valid VLAN
> > ID, check the actual VLAN IDs passed in to the callback
> > one by one as expected.
> >
> > Fixes: d8652956cf37 ("net: dsa: realtek-smi: Add Realtek SMI driver")
> > Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > ---
> >  drivers/net/dsa/rtl8366.c | 12 ++++++++----
> >  1 file changed, 8 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/dsa/rtl8366.c b/drivers/net/dsa/rtl8366.c
> > index ca3d17e43ed8..e2c91b75e843 100644
> > --- a/drivers/net/dsa/rtl8366.c
> > +++ b/drivers/net/dsa/rtl8366.c
> > @@ -340,9 +340,11 @@ int rtl8366_vlan_prepare(struct dsa_switch *ds, int port,
> >  {
> >       struct realtek_smi *smi = ds->priv;
> >       int ret;
> > +     int i;
> >
> > -     if (!smi->ops->is_vlan_valid(smi, port))
> > -             return -EINVAL;
> > +     for (i = vlan->vid_begin; i < vlan->vid_end; i++)
> > +             if (!smi->ops->is_vlan_valid(smi, port))
> > +                     return -EINVAL;
>
> You are still checking the port and not the "i" (VLAN ID) argument here,
> is there something I am missing?

No you're right, just correcting old mistakes by making
new mistakes .. I'll fix, thanks!

Yours,
Linus Walleij