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Drivers will commonly perform feature setting during init, if they use
the xdp_set_features_flag() helper they'll likely run into an ASSERT_RTNL()
inside call_netdevice_notifiers_info().
Don't call the notifier until the device is actually registered.
Nothing should be tracking the device until its registered and
after its unregistration has started.
Fixes: 4d5ab0ad96 ("net/mlx5e: take into account device reconfiguration for xdp_features flag")
Link: https://lore.kernel.org/r/20230316220234.598091-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>