netdev - Re: [PATCH net-next] net: dsa: mv88e6xxx: fix freeing unused SERDES IRQ

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Message-ID: <20190829065124.1e234e7a@nic.cz>
Date:   Thu, 29 Aug 2019 06:51:24 +0200
From:   Marek Behun <marek.behun@....cz>
To:     Vivien Didelot <vivien.didelot@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, f.fainelli@...il.com,
        andrew@...n.ch
Subject: Re: [PATCH net-next] net: dsa: mv88e6xxx: fix freeing unused SERDES
 IRQ

On Wed, 28 Aug 2019 14:55:11 -0400
Vivien Didelot <vivien.didelot@...il.com> wrote:

> Now mv88e6xxx does not enable its ports at setup itself and let
> the DSA core handle this, unused ports are disabled without being
> powered on first. While that is expected, the SERDES powering code
> was assuming that a port was already set up before powering it down,
> resulting in freeing an unused IRQ. The patch fixes this assumption.
> 
> Fixes: b759f528ca3d ("net: dsa: mv88e6xxx: enable SERDES after setup")
> Signed-off-by: Vivien Didelot <vivien.didelot@...il.com>
> ---
>  drivers/net/dsa/mv88e6xxx/chip.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index 6525075f6bd3..c648f9fbfa59 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -2070,7 +2070,8 @@ static int mv88e6xxx_serdes_power(struct mv88e6xxx_chip *chip, int port,
>  		if (chip->info->ops->serdes_irq_setup)
>  			err = chip->info->ops->serdes_irq_setup(chip, port);
>  	} else {
> -		if (chip->info->ops->serdes_irq_free)
> +		if (chip->info->ops->serdes_irq_free &&
> +		    chip->ports[port].serdes_irq)
>  			chip->info->ops->serdes_irq_free(chip, port);
>  
>  		err = chip->info->ops->serdes_power(chip, port, false);

Reviewed-by: Marek Behún <marek.behun@....cz>