linux-kernel - Re: [net-next PATCH v5 15/15] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver

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Message-ID: <20210216095959.GA1015@lsv03152.swis.in-blr01.nxp.com>
Date:   Tue, 16 Feb 2021 15:29:59 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>, Saravana Kannan <saravanak@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux.cj" <linux.cj@...il.com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        netdev <netdev@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ioana Radulescu <ruxandra.radulescu@....com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next PATCH v5 15/15] net: dpaa2-mac: Add ACPI support for
 DPAA2 MAC driver

On Mon, Feb 15, 2021 at 05:15:36PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 5:13 PM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> >
> > On Mon, Feb 15, 2021 at 2:33 PM Calvin Johnson
> > <calvin.johnson@....nxp.com> wrote:
> > > On Mon, Feb 08, 2021 at 04:28:31PM +0000, Russell King - ARM Linux admin wrote:
> >
> > ...
> >
> > > I think of_phy_is_fixed_link() needs to be fixed. I'll add below fix.
> > >
> > > --- a/drivers/net/mdio/of_mdio.c
> > > +++ b/drivers/net/mdio/of_mdio.c
> > > @@ -439,6 +439,9 @@ bool of_phy_is_fixed_link(struct device_node *np)
> > >         int len, err;
> > >         const char *managed;
> > >
> > > +       if (!np)
> > > +               return false;
> >
> > AFAICS this doesn't add anything: all of the of_* APIs should handle
> > OF nodes being NULL below.
> >
> > >         /* New binding */
> > >         dn = of_get_child_by_name(np, "fixed-link");
> > >         if (dn) {
> 
> Yes, of_get_next_child() and of_get_property() are NULL aware.
> 
> So, the check is redundant.
Yes, all the function calls in of_phy_is_fixed_link() handles NULL properly.
I don't see any way this function can oops.

Regards
Calvin