Subject: Re: [PATCH net-next 2/5] net: phylink: allow attaching phy for SFP modules on 802.3z mode

From: Russell King - ARM Linux admin <[email-masked]>
Date: Thu, 29 Oct 2020 12:08:10 +0000

On Wed, Oct 28, 2020 at 11:14:24PM +0100, Marek Behún wrote:
> Some SFPs may contain an internal PHY which may in some cases want to
> connect with the host interface in 1000base-x/2500base-x mode.
> Do not fail if such PHY is being attached in one of these PHY interface
> modes.
> 
> Signed-off-by: Marek Behún <[email-masked]>
> Cc: Andrew Lunn <[email-masked]>
> Cc: Russell King <[email-masked]>
> ---
>  drivers/net/phy/phylink.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 5d8c015bc9f2..52954f12ca5e 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -1018,7 +1018,7 @@ static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
>  {
>  	if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
>  		    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
> -		     phy_interface_mode_is_8023z(interface))))
> +		     phy_interface_mode_is_8023z(interface) && !pl->sfp_bus)))
>  		return -EINVAL;
>  
>  	if (pl->phydev)

I think also changing phylink_sfp_config() too since that check is no
longer relevent - although it doesn't actually end up being effective
today. So, might as well be removed along with the above change.

-- 
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