netdev - Re: [PATCH net] net: dsa: mv88e6xxx: fix few issues in mv88e6390x_port_set

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Date:   Wed, 27 Mar 2019 14:22:23 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: dsa: mv88e6xxx: fix few issues in
 mv88e6390x_port_set_cmode

On 3/23/19 11:41 AM, Heiner Kallweit wrote:
> This patches fixes few issues in mv88e6390x_port_set_cmode().
> 
> 1. When entering the function the old cmode may be 0, in this case
>    mv88e6390x_serdes_get_lane() returns -ENODEV. As result we bail
>    out and have no chance to set a new mode. Therefore deal properly
>    with -ENODEV.
> 
> 2. Once we have disabled power and irq, let's set the cached cmode to 0.
>    This reflects the actual status and is cleaner if we bail out with an
>    error in the following function calls.
> 
> 3. The cached cmode is used by mv88e6390x_serdes_get_lane(),
>    mv88e6390_serdes_power_lane() and mv88e6390_serdes_irq_enable().
>    Currently we set the cached mode to the new one at the very end of
>    the function only, means until then we use the old one what may be
>    wrong.
> 
> 4. When calling mv88e6390_serdes_irq_enable() we use the lane value
>    belonging to the old cmode. Get the lane belonging to the new cmode
>    before calling this function.
> 
> It's hard to provide a good "Fixes" tag because quite a few smaller
> changes have been done to the code in question recently.
> 
> Fixes: d235c48b40d3 ("net: dsa: mv88e6xxx: power serdes on/off for 10G interfaces on 6390X")
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/dsa/mv88e6xxx/port.c | 24 ++++++++++++++++--------
>  1 file changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
> index dce84a2a6..c44b2822e 100644
> --- a/drivers/net/dsa/mv88e6xxx/port.c
> +++ b/drivers/net/dsa/mv88e6xxx/port.c
> @@ -427,18 +427,22 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
>  		return 0;
>  
>  	lane = mv88e6390x_serdes_get_lane(chip, port);
> -	if (lane < 0)
> +	if (lane < 0 && lane != -ENODEV)
>  		return lane;

It does not look like you can return a negative error code from
mv88e6390x_serdes_get_lane() that is not -ENODEV?

Other than that:

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian