linux-kernel - Re: [PATCH][next] net: dsa: sja1105: Fix assigned yet unused return code rc

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Date:   Thu, 10 Jun 2021 20:51:24 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Colin King <colin.king@...onical.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>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net: dsa: sja1105: Fix assigned yet unused return
 code rc

On Thu, Jun 10, 2021 at 09:23:58AM +0300, Dan Carpenter wrote:
> On Wed, Jun 09, 2021 at 06:43:53PM +0100, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > The return code variable rc is being set to return error values in two
> > places in sja1105_mdiobus_base_tx_register and yet it is not being
> > returned, the function always returns 0 instead. Fix this by replacing
> > the return 0 with the return code rc.
> > 
> > Addresses-Coverity: ("Unused value")
> > Fixes: 5a8f09748ee7 ("net: dsa: sja1105: register the MDIO buses for 100base-T1 and 100base-TX")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/net/dsa/sja1105/sja1105_mdio.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/dsa/sja1105/sja1105_mdio.c b/drivers/net/dsa/sja1105/sja1105_mdio.c
> > index 8dfd06318b23..08517c70cb48 100644
> > --- a/drivers/net/dsa/sja1105/sja1105_mdio.c
> > +++ b/drivers/net/dsa/sja1105/sja1105_mdio.c
> > @@ -171,7 +171,7 @@ static int sja1105_mdiobus_base_tx_register(struct sja1105_private *priv,
> >  out_put_np:
> >  	of_node_put(np);
> >  
> > -	return 0;
> > +	return rc;
> 
> Should this function really return success if of_device_is_available()?

If _not_ of_device_is_available you mean? Yup. Nothing wrong with not
having an internal MDIO bus. This is a driver which supports switches
that do and switches that don't, and even if the node exists, it may
have status = "disabled", which is again fine.
Or am I misunderstanding the question?