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

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Message-ID: <20210610181937.GA10983@kadam>
Date:   Thu, 10 Jun 2021 21:19:38 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Vladimir Oltean <olteanv@...il.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 08:51:24PM +0300, Vladimir Oltean wrote:
> 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?

Yeah.  I left out the "!".  That answers the question.  Thanks!

regards,
dan carpenter