Re: [net-next PATCH v3 5/5] net: mdiobus: Introduce fwnode_mdiobus_register_phy()

[Andy Shevchenko]

On Thu, May 7, 2020 at 10:44 AM Calvin Johnson
<calvin.johnson@xxxxxxxxxxx> wrote:
>
> On Tue, May 05, 2020 at 05:22:00PM +0300, Andy Shevchenko wrote:
> > On Tue, May 5, 2020 at 4:30 PM Calvin Johnson
> > <calvin.johnson@xxxxxxxxxxx> wrote:

...

> > > +       bool is_c45 = false;
> >
> > Redundant assignment, see below.
> >
> > > +       const char *cp;
> > > +       u32 phy_id;
> > > +       int rc;

> > > +       fwnode_property_read_string(child, "compatible", &cp);
> >
> > Consider rc = ...; otherwise you will have UB below.
> >
> > > +       if (!strcmp(cp, "ethernet-phy-ieee802.3-c45"))
> >
> > UB!
>
> Thanks for the comments! I've considered all of them.
> What is UB, by the way? :)-

Undefined Behaviour.

-- 
With Best Regards,
Andy Shevchenko