linux-kernel - Re: [PATCH] net: phy: turn carrier off on phy attach

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Date:	Mon, 11 Jan 2016 17:17:23 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sjoerd.simons@...labora.co.uk
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	f.fainelli@...il.com, andrew@...n.ch
Subject: Re: [PATCH] net: phy: turn carrier off on phy attach

From: Sjoerd Simons <sjoerd.simons@...labora.co.uk>
Date: Sat,  9 Jan 2016 19:44:05 +0100

> The operstate of a networking device initially IF_OPER_UNKNOWN aka
> "unknown", updated on carrier state changes (with carrier state being on
> by default). This means it will stay unknown unless the carrier state
> goes to off at some point, which is not the case if the phy is already
> up/connected at startup.
> 
> Explicitly turn off the carrier on phy attach, leaving the phy state
> machine to turn the carrier on when it has done the initial negotiation.
> 
> Signed-off-by: Sjoerd Simons <sjoerd.simons@...labora.co.uk>

Florian or Andrew, please review this.

Thanks.

> 
> ---
> 
>  drivers/net/phy/phy_device.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 0bfbaba..a30ce1a 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -668,6 +668,11 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
>  
>  	phydev->state = PHY_READY;
>  
> +	/* Signal to the core network layer the phy supports
> +	 *  carrier detection
> +	 */
> +	netif_carrier_off(phydev->attached_dev);
> +
>  	/* Do initial configuration here, now that
>  	 * we have certain key parameters
>  	 * (dev_flags and interface)
> -- 
> 2.7.0.rc3
>