netdev - Re: [PATCH] net: fec: Fix phy_device lookup for phy_reset_after_clk

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Message-ID: <110b63bb-9096-7ce0-530f-45dffed09077@gmail.com>
Date:   Tue, 6 Oct 2020 14:09:05 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Marek Vasut <marex@...x.de>, netdev@...r.kernel.org
Cc:     Christoph Niedermaier <cniedermaier@...electronics.com>,
        "David S . Miller" <davem@...emloft.net>,
        NXP Linux Team <linux-imx@....com>,
        Richard Leitner <richard.leitner@...data.com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH] net: fec: Fix phy_device lookup for
 phy_reset_after_clk_enable()



On 10/6/2020 1:20 PM, Marek Vasut wrote:
> The phy_reset_after_clk_enable() is always called with ndev->phydev,
> however that pointer may be NULL even though the PHY device instance
> already exists and is sufficient to perform the PHY reset.
> 
> If the PHY still is not bound to the MAC, but there is OF PHY node
> and a matching PHY device instance already, use the OF PHY node to
> obtain the PHY device instance, and then use that PHY device instance
> when triggering the PHY reset.
> 
> Fixes: 1b0a83ac04e3 ("net: fec: add phy_reset_after_clk_enable() support")
> Signed-off-by: Marek Vasut <marex@...x.de>
> Cc: Christoph Niedermaier <cniedermaier@...electronics.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: NXP Linux Team <linux-imx@....com>
> Cc: Richard Leitner <richard.leitner@...data.com>
> Cc: Shawn Guo <shawnguo@...nel.org>
> ---
>   drivers/net/ethernet/freescale/fec_main.c | 22 ++++++++++++++++++++--
>   1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index 2d5433301843..5a4b20941aeb 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1912,6 +1912,24 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
>   	return ret;
>   }
>   
> +static void fec_enet_phy_reset_after_clk_enable(struct net_device *ndev)
> +{
> +	struct fec_enet_private *fep = netdev_priv(ndev);
> +	struct phy_device *phy_dev = ndev->phydev;
> +
> +	/*
> +	 * If the PHY still is not bound to the MAC, but there is
> +	 * OF PHY node and a matching PHY device instance already,
> +	 * use the OF PHY node to obtain the PHY device instance,
> +	 * and then use that PHY device instance when triggering
> +	 * the PHY reset.
> +	 */
> +	if (!phy_dev && fep->phy_node)
> +		phy_dev = of_phy_find_device(fep->phy_node);

Don't you need to put the phy_dev reference at some point?
-- 
Florian