netdev - Re: [PATCH V2] net: fec: Fix phy_device lookup for phy_reset_after_clk

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Message-ID: <20201012142315.053f13f7@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 12 Oct 2020 14:23:15 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Marek Vasut <marex@...x.de>
Cc:     netdev@...r.kernel.org,
        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 V2] net: fec: Fix phy_device lookup for
 phy_reset_after_clk_enable()

On Sat, 10 Oct 2020 11:10:00 +0200 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.
> 
> This condition happens in fec_open(), where the clock must be enabled
> first, then the PHY must be reset, and then the PHY IDs can be read
> out of the PHY.
> 
> 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>

Applied.