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Subject: Re: [PATCH] mdio_bus: suppress err message for reset gpio
 EPROBE_DEFER
To:     Grygorii Strashko <grygorii.strashko@ti.com>,
        "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
        Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>
Cc:     linux-kernel@vger.kernel.org
References: <20201118142426.25369-1-grygorii.strashko@ti.com>
From:   Heiner Kallweit <hkallweit1@gmail.com>
Message-ID: <0329ed05-371b-0bb5-4f85-75ecaff6a70b@gmail.com>
Date:   Thu, 19 Nov 2020 13:30:09 +0100
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Am 18.11.2020 um 15:24 schrieb Grygorii Strashko:
> The mdio_bus may have dependencies from GPIO controller and so got
> deferred. Now it will print error message every time -EPROBE_DEFER is
> returned from:
> __mdiobus_register()
>  |-devm_gpiod_get_optional()
> without actually identifying error code.
> 
> "mdio_bus 4a101000.mdio: mii_bus 4a101000.mdio couldn't get reset GPIO"
> 
> Hence, suppress error message when devm_gpiod_get_optional() returning
> -EPROBE_DEFER case.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
> ---
>  drivers/net/phy/mdio_bus.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> index 757e950fb745..54fc13043656 100644
> --- a/drivers/net/phy/mdio_bus.c
> +++ b/drivers/net/phy/mdio_bus.c
> @@ -546,10 +546,11 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
>  	/* de-assert bus level PHY GPIO reset */
>  	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);
>  	if (IS_ERR(gpiod)) {
> -		dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",
> -			bus->id);
> +		err = PTR_ERR(gpiod);
> +		if (err != -EPROBE_DEFER)
> +			dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO %d\n", bus->id, err);
>  		device_del(&bus->dev);
> -		return PTR_ERR(gpiod);
> +		return err;
>  	} else	if (gpiod) {
>  		bus->reset_gpiod = gpiod;
>  
> 

Using dev_err_probe() here would simplify the code.