linux-kernel - Re: [PATCH -next] net: dsa: mv88e6xxx: Fix build warning when CONFIG_NET_DSA

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Message-ID: <20190304132617.GB26378@lunn.ch>
Date:   Mon, 4 Mar 2019 14:26:17 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Shaokun Zhang <zhangshaokun@...ilicon.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH -next] net: dsa: mv88e6xxx: Fix build warning when
 CONFIG_NET_DSA_LEGACY is n

On Mon, Mar 04, 2019 at 08:43:01PM +0800, Shaokun Zhang wrote:
> When CONFIG_NET_DSA_LEGACY is n, there is a GCC bulid warning:
> drivers/net/dsa/mv88e6xxx/chip.c:4623:13: warning: ‘mv88e6xxx_ports_cmode_init’ defined but not used [-Wunused-function]
> static void mv88e6xxx_ports_cmode_init(struct mv88e6xxx_chip *chip)
> Let's fix it.

Hi Shaokun, Heiner

Although this fixes the warning, i suspect there i something wrong
with the original patch adding mv88e6390x_port_set_cmode(). It should
also be used without CONFIG_NET_DSA_LEGACY.

     Andrew


> 
> Fixes: ed8fe20205ac ("net: dsa: mv88e6xxx: prevent interrupt storm caused by mv88e6390x_port_set_cmode")
> Cc: Heiner Kallweit <hkallweit1@...il.com>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Vivien Didelot <vivien.didelot@...il.com> 
> Cc: Florian Fainelli <f.fainelli@...il.com> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Signed-off-by: Shaokun Zhang <zhangshaokun@...ilicon.com>
> ---
>  drivers/net/dsa/mv88e6xxx/chip.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index e4ad16b2dc38..168d4898c36f 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -4620,14 +4620,6 @@ static int mv88e6xxx_smi_init(struct mv88e6xxx_chip *chip,
>  	return 0;
>  }
>  
> -static void mv88e6xxx_ports_cmode_init(struct mv88e6xxx_chip *chip)
> -{
> -	int i;
> -
> -	for (i = 0; i < mv88e6xxx_num_ports(chip); i++)
> -		chip->ports[i].cmode = MV88E6XXX_PORT_STS_CMODE_INVALID;
> -}
> -
>  static enum dsa_tag_protocol mv88e6xxx_get_tag_protocol(struct dsa_switch *ds,
>  							int port)
>  {
> @@ -4637,6 +4629,14 @@ static enum dsa_tag_protocol mv88e6xxx_get_tag_protocol(struct dsa_switch *ds,
>  }
>  
>  #if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
> +static void mv88e6xxx_ports_cmode_init(struct mv88e6xxx_chip *chip)
> +{
> +	int i;
> +
> +	for (i = 0; i < mv88e6xxx_num_ports(chip); i++)
> +		chip->ports[i].cmode = MV88E6XXX_PORT_STS_CMODE_INVALID;
> +}
> +
>  static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
>  				       struct device *host_dev, int sw_addr,
>  				       void **priv)
> -- 
> 2.7.4
>