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When ndo_set_rx_mode_async returns an error, schedule a retry with exponential backoff (1s, 2s, 4s, 8s -- 15s total). Give up after the 4th retry and log an error via netdev_err(). This moves retry logic from individual drivers into the core stack. Timer callback does not hold a ref on dev. Safe because the timer can only be armed when dev is IFF_UP, and __dev_close_many runs timer_delete_sync before clearing IFF_UP. Unregister always closes IFF_UP devices first, so by the time dev can be freed the timer is dead and cannot be re-armed. Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Stanislav Fomichev <sdf@fomichev.me> Link: https://patch.msgid.link/20260608154014.227538-3-sdf@fomichev.me Signed-off-by: Jakub Kicinski <kuba@kernel.org>