netdev - Re: [PATCH net v3 2/3] libphy: Add stubs to hook IEEE MMD Register reads and writes

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Date:	Mon, 23 Jun 2014 16:29:10 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Vince Bridgers <vbridgers2013@...il.com>, f.fainelli@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net v3 2/3] libphy: Add stubs to hook IEEE MMD Register
 reads and writes

Hello.

On 06/23/2014 04:21 AM, Vince Bridgers wrote:

> The Micrel ksz9021 PHY does not support standard IEEE standard MMD
> extended register access, therefore requires stubs to fail the read
> register method and do nothing for the write register method when
> libphy attempts to read and/or configure Energy Efficient Ethernet
> features in PHYS that do support those features. This problem
> was observed on an Altera Cyclone V SOC development kit that
> uses the Synopsys EMAC and the Micrel ksz9021 PHY. This patch
> was tested on the same board, and Energy Efficient Ethernet is
> now disabled as expected since the Micrel PHY does not support that
> feature.

> Signed-off-by: Vince Bridgers <vbridgers2013@...il.com>
> ---
> V3: Remove unnecessary returns from void functions.
> V2: Split libphy and Micrel specific changes into 2 patches
>      based on review comments
> ---
>   drivers/net/phy/micrel.c |   23 ++++++++++++++++++++++-
>   1 file changed, 22 insertions(+), 1 deletion(-)

> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index bc7c7d2..daf8bab 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -417,7 +417,26 @@ static int ksz8873mll_read_status(struct phy_device *phydev)
>
>   static int ksz8873mll_config_aneg(struct phy_device *phydev)
>   {
> -	return 0;

    Eh? The function returns *int* and you're removing the only *return* 
statement?

> +}

WBR, Sergei

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