Add a lockless read for QoS flags similar to the lockless read for resume latency (dev_pm_qos_raw_resume_latency) which may be called from atomic context (e.g. genpd governors running under a raw spinlock or in the syscore suspend path), where taking that sleeping lock would be invalid on PREEMPT_RT. dev_pm_qos_raw_flags() now reads dev->power.qos->flags.effective_flags with READ_ONCE() so also add corresponding WRITE_ONCE() to the two effective_flags writes, the same way pm_qos_set_value() already does for target_value/pm_qos_read_value(). Reviewed-by: Kendall Willis <k-willis@ti.com> Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org> Signed-off-by: Kevin Hilman (TI) <khilman@baylibre.com> Signed-off-by: Ulf Hansson <ulfh@kernel.org>