[PATCH 1/2] net: phy: Make phy_interface_is_sgmii a switch statement

[Nishanth Menon]

On 20:56-20230413, Marek Behún wrote:
> On Thu, Apr 13, 2023 at 01:07:12PM -0500, Nishanth Menon wrote:
> > Recent commit 75d28899e3e9 ("net: phy: Synchronize PHY interface modes
> > with Linux") reordered the enum definitions. This caused the range of
> > enums that this api was checking to go bad.
> > 
> > While it is possible for the phy drivers to practically use the enum's
> > directly, drivers such as dp83867 use this helper to manage the
> > configuration of the phy correctly.
> > 
> > Reported-by: Tom Rini <trini at konsulko.com>
> > Signed-off-by: Nishanth Menon <nm at ti.com>
> > ---
> >  include/phy.h | 12 ++++++++++--
> >  1 file changed, 10 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/phy.h b/include/phy.h
> > index a837fed72352..1c4dc23bc5ba 100644
> > --- a/include/phy.h
> > +++ b/include/phy.h
> > @@ -373,8 +373,16 @@ static inline bool phy_interface_is_rgmii(struct phy_device *phydev)
> >   */
> >  static inline bool phy_interface_is_sgmii(struct phy_device *phydev)
> >  {
> > -	return phydev->interface >= PHY_INTERFACE_MODE_SGMII &&
> > -		phydev->interface <= PHY_INTERFACE_MODE_QSGMII;
> > +	switch (phydev->interface) {
> > +	case PHY_INTERFACE_MODE_SGMII:
> > +	case PHY_INTERFACE_MODE_QUSGMII:
> > +	case PHY_INTERFACE_MODE_USXGMII:
> > +	case PHY_INTERFACE_MODE_QSGMII:
> > +		return 1;
> > +	default:
> > +		fallthrough;
> 
> Why not just put the return 0; statement here instead of fallthrough and
> drop it from after the switch statement?

Just dropping the default also will work, though it does leave something
un-handled. handling the default on the other hand allows for additional
code (meh?) to be added in default.. But really what? I'd rather drop
the default and fall through to save on a couple of lines.. if that
is'nt creating confusion..

> > +	}
> > +	return 0;
> >  }

-- 
Regards,
Nishanth Menon
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