From: Grygorii Strashko <grygorii.strashko@xxxxxx>
Date: Fri, 16 Mar 2018 17:08:33 -0500
> Some ethernet drivers (like TI CPSW) may connect and manage >1 Net PHYs per
> one netdevice, as result such drivers will produce warning during system
> boot and fail to connect second phy to netdevice when PHYLIB framework
> will try to create sysfs link netdev->phydev for second PHY
> in phy_attach_direct(), because sysfs link with the same name has been
> created already for the first PHY.
> As result, second CPSW external port will became unusable.
> This regression was introduced by commits:
> 5568363f0cb3 ("net: phy: Create sysfs reciprocal links for attached_dev/phydev"
> a3995460491d ("net: phy: Relax error checking on sysfs_create_link()"
>
> Patch 1: exports sysfs_create_link_nowarn() function as preparation for Patch 2.
> Patch 2: relaxes error checking when PHYLIB framework is creating sysfs
> link netdev->phydev in phy_attach_direct(), suppresses warning by using
> sysfs_create_link_nowarn() and adds error message instead, so links creation
> failure is not fatal any more and system can continue working,
> which fixes TI CPSW issue and makes boot logs accessible
> in case of NFS boot, for example.
Series applied and queued up for -stable, thanks.
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