netdev - Re: [PATCH v4] net: dsa: microchip: call phy_remove_link

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Date:   Tue, 21 Jul 2020 17:20:07 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Helmut Grohne <helmut.grohne@...enta.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Tristram Ha <Tristram.Ha@...rochip.com>
Subject: Re: [PATCH v4] net: dsa: microchip: call phy_remove_link_mode during
 probe

On Tue, Jul 21, 2020 at 01:07:39PM +0200, Helmut Grohne wrote:
> When doing "ip link set dev ... up" for a ksz9477 backed link,
> ksz9477_phy_setup is called and it calls phy_remove_link_mode to remove
> 1000baseT HDX. During phy_remove_link_mode, phy_advertise_supported is
> called. Doing so reverts any previous change to advertised link modes
> e.g. using a udevd .link file.
> 
> phy_remove_link_mode is not meant to be used while opening a link and
> should be called during phy probe when the link is not yet available to
> userspace.
> 
> Therefore move the phy_remove_link_mode calls into
> ksz9477_switch_register. It indirectly calls dsa_register_switch, which
> creates the relevant struct phy_devices and we update the link modes
> right after that. At that time dev->features is already initialized by
> ksz9477_switch_detect.
> 
> Remove phy_setup from ksz_dev_ops as no users remain.
> 
> Link: https://lore.kernel.org/netdev/20200715192722.GD1256692@lunn.ch/
> Fixes: 42fc6a4c613019 ("net: dsa: microchip: prepare PHY for proper advertisement")
> Signed-off-by: Helmut Grohne <helmut.grohne@...enta.de>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew