linux-kernel - Re: [PATCH v2] net: dsa: mv88e6xxx: error handling for serdes

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Message-ID: <20211208140957.GA96979@hamza-OptiPlex-7040>
Date:   Wed, 8 Dec 2021 19:09:57 +0500
From:   Ameer Hamza <amhamza.mgc@...il.com>
To:     kabel@...nel.org, kuba@...nel.org, andrew@...n.ch
Cc:     vivien.didelot@...il.com, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: dsa: mv88e6xxx: error handling for serdes_power
 functions

On Wed, Dec 08, 2021 at 07:04:13PM +0500, Ameer Hamza wrote:
> mv88e6390_serdes_power() and mv88e6393x_serdes_power() should return
> with EINVAL error if cmode is undefined.
> 
> Signed-off-by: Ameer Hamza <amhamza.mgc@...il.com>
> ---
>  drivers/net/dsa/mv88e6xxx/serdes.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
> index 33727439724a..f3dc1865f291 100644
> --- a/drivers/net/dsa/mv88e6xxx/serdes.c
> +++ b/drivers/net/dsa/mv88e6xxx/serdes.c
> @@ -830,7 +830,7 @@ int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
>  			   bool up)
>  {
>  	u8 cmode = chip->ports[port].cmode;
> -	int err = 0;
> +	int err;
>  
>  	switch (cmode) {
>  	case MV88E6XXX_PORT_STS_CMODE_SGMII:
> @@ -842,6 +842,8 @@ int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
>  	case MV88E6XXX_PORT_STS_CMODE_RXAUI:
>  		err = mv88e6390_serdes_power_10g(chip, lane, up);
>  		break;
> +	default:
> +		return -EINVAL;
>  	}
>  
>  	if (!err && up)
> @@ -1507,7 +1509,7 @@ int mv88e6393x_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
>  			    bool on)
>  {
>  	u8 cmode = chip->ports[port].cmode;
> -	int err = 0;
> +	int err;
>  
>  	if (port != 0 && port != 9 && port != 10)
>  		return -EOPNOTSUPP;
> @@ -1541,6 +1543,8 @@ int mv88e6393x_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
>  	case MV88E6393X_PORT_STS_CMODE_10GBASER:
>  		err = mv88e6390_serdes_power_10g(chip, lane, on);
>  		break;
> +	default:
> +		return -EINVAL;
>  	}
>  
>  	if (err)
> -- 
> 2.25.1
>
Hi Marek,

I checked serdes.c and I found two methods mv88e6390_serdes_power() and
mv88e6390_serdes_power() that were not returning ENINVAL in case of
undefined cmode. Would be appreciated if  you can review the patch
please.

Best Regards,
Ameer Hamza.