netdev - Re: [PATCH RFC net-next v2 01/10] net: dsa: mt7530: fix incorrect test in mt753x_phylink

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Date:   Wed, 23 Feb 2022 13:21:01 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC net-next v2 01/10] net: dsa: mt7530: fix incorrect
 test in mt753x_phylink_validate()

On Wed, Feb 23, 2022 at 03:12:00PM +0200, Vladimir Oltean wrote:
> Hello,
> 
> On Wed, Feb 23, 2022 at 11:34:17AM +0000, Russell King (Oracle) wrote:
> > Discussing one of the tests in mt753x_phylink_validate() with Landen
> > Chao confirms that the "||" should be "&&". Fix this.
> > 
> > Fixes: c288575f7810 ("net: dsa: mt7530: Add the support of MT7531 switch")
> > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > ---
> >  drivers/net/dsa/mt7530.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> > index f74f25f479ed..69abca77ea1a 100644
> > --- a/drivers/net/dsa/mt7530.c
> > +++ b/drivers/net/dsa/mt7530.c
> > @@ -2936,7 +2936,7 @@ mt753x_phylink_validate(struct dsa_switch *ds, int port,
> >  
> >  	phylink_set_port_modes(mask);
> >  
> > -	if (state->interface != PHY_INTERFACE_MODE_TRGMII ||
> > +	if (state->interface != PHY_INTERFACE_MODE_TRGMII &&
> >  	    !phy_interface_mode_is_8023z(state->interface)) {
> >  		phylink_set(mask, 10baseT_Half);
> >  		phylink_set(mask, 10baseT_Full);
> > -- 
> > 2.30.2
> > 
> 
> Since the "net" pull request for this week is scheduled to happen rather
> soon, I think you should split this and send it to "net", so that you
> won't have to wait when you resend as non-RFC.

I don't believe this is an urgent issue. The issue has existed since
MT7531 support was added in September 2020, and no one has raised it
as a problem until I identified the clearly incorrect expression.

What if fixing this unmasks a problem elsewhere?

Therefore, I see no reason to rush getting this fix into the -rc
kernel, especially without a review and preferably testing by the
driver authors.

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