650b2e69ff6a ("md: clean up openers check in do_md_stop() and md_set_readonly()")
61c90765e131 ("md: remove redundant check of 'mddev->sync_thread'")
c9f7cb5b2bc9 ("md: don't leave 'MD_RECOVERY_FROZEN' in error path of md_set_readonly()")
09f894affcf2 ("md: do not require mddev_lock() for all options in array_state_store()")
f97a5528b21e ("md: introduce md_ro_state")