linux-kernel - Re: [PATCH] net: of_mdio: fix behavior on missing phy device

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Message-ID: <51894021.1070900@cogentembedded.com>
Date:	Tue, 07 May 2013 21:55:45 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	David Miller <davem@...emloft.net>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net: of_mdio: fix behavior on missing phy device

Hello.

On 07-05-2013 13:49, Sebastian Hesselbarth wrote:

> of_mdiobus_register creates a phy_device even if get_phy_device failed
> to create it previously. This causes indefinite polling on non-existent
> PHYs. This fix makes of_mdio_register rely on get_phy_device to
> properly create the device or fail otherwise.

> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
> ---
> Cc: Grant Likely <grant.likely@...aro.org>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: David Miller <davem@...emloft.net>
> Cc: devicetree-discuss@...ts.ozlabs.org
> Cc: linux-kernel@...r.kernel.org
> Cc: netdev@...r.kernel.org
> ---
>   drivers/of/of_mdio.c |   11 ++++-------
>   1 file changed, 4 insertions(+), 7 deletions(-)

> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index 23049ae..d5a57a9 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -84,13 +84,10 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
>   		phy = get_phy_device(mdio, addr, is_c45);
>

    This empty line is not needed -- would be good to drop it, while at 
this.

>   		if (!phy || IS_ERR(phy)) {
> -			phy = phy_device_create(mdio, addr, 0, false, NULL);
> -			if (!phy || IS_ERR(phy)) {
> -				dev_err(&mdio->dev,
> -					"error creating PHY at address %i\n",
> -					addr);
> -				continue;
> -			}
> +			dev_err(&mdio->dev,
> +				"cannot get PHY at address %i\n",
> +				addr);
> +			continue;
>   		}
>
>   		/* Associate the OF node with the device structure so it
>

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