net: phy: don't allow __set_phy_supported to add unsupported modes
BugLink: https://bugs.launchpad.net/bugs/1811080 [ Upstream commit d2a36971 ] Currently __set_phy_supported allows to add modes w/o checking whether the PHY supports them. This is wrong, it should never add modes but only remove modes we don't want to support. The commit marked as fixed didn't do anything wrong, it just copied existing functionality to the helper which is being fixed now. Fixes: f3a6bd39 ("phylib: Add phy_set_max_speed helper") Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Juerg Haefliger <juergh@canonical.com> Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
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