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phydev <> netdev linking and lifecycle depends on rtnl_lock. We want to switch to instance locks for most ethtool ops. Let's add an assert that ops locked devices don't use phydev today. If one does we can either opt the phy ops out of being purely ops locked, or do deeper surgery to make phy locking ops-compatible. I don't think there's any fundamental challenge to make that work. Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de> Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Link: https://patch.msgid.link/20260605002912.3456868-3-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>