netdev - RE: [PATCH net-next 3/4] net: phy: keep track of the PHY suspend state

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Date:	Tue, 27 Jan 2015 02:43:45 +0000
From:	"fugang.duan@...escale.com" <fugang.duan@...escale.com>
To:	Florian Fainelli <f.fainelli@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Subject: RE: [PATCH net-next 3/4] net: phy: keep track of the PHY suspend
 state

From: Florian Fainelli <f.fainelli@...il.com> Sent: Tuesday, January 27, 2015 8:31 AM
> To: netdev@...r.kernel.org
> Cc: davem@...emloft.net; s.hauer@...gutronix.de; Duan Fugang-B38611;
> Florian Fainelli
> Subject: [PATCH net-next 3/4] net: phy: keep track of the PHY suspend
> state
> 
> In order to avoid double calls to phydev->drv->suspend and resume, keep
> track of whether the PHY has already been suspended as a consequence of a
> successful call to phy_suspend(). We will use this in our MDIO bus
> suspend/resume hooks to avoid a double suspend call.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/net/phy/phy_device.c | 22 ++++++++++++++++++----
>  include/linux/phy.h          |  2 ++
>  2 files changed, 20 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 3fc91e89f5a5..c90cecc0fe15 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -699,6 +699,7 @@ int phy_suspend(struct phy_device *phydev)  {
>  	struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
>  	struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
> +	int ret = 0;
> 
>  	/* If the device has WOL enabled, we cannot suspend the PHY */
>  	phy_ethtool_get_wol(phydev, &wol);
> @@ -706,18 +707,31 @@ int phy_suspend(struct phy_device *phydev)
>  		return -EBUSY;
> 
>  	if (phydrv->suspend)
> -		return phydrv->suspend(phydev);
> -	return 0;
> +		ret = phydrv->suspend(phydev);
> +
> +	if (ret)
> +		return ret;
> +
> +	phydev->suspended = true;
> +
> +	return ret;
>  }
>  EXPORT_SYMBOL(phy_suspend);
> 
>  int phy_resume(struct phy_device *phydev)  {
>  	struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
> +	int ret;

=> int ret = 0;
[...]

Regards,
Andy
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