PM-runtime: Optimize pm_runtime_autosuspend_expiration() (f800ea32) · Commits · 戴 / test

pm_runtime_autosuspend_expiration calls ktime_get_mono_fast_ns() even when its returned value may be unused. Therefore get the current time later and remove gotos while there. Signed-off-by:

Ladislav Michl <ladis@linux-mips.org> Acked-by:

Tony Lindgren <tony@atomide.com> Acked-by:

Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by:

Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/runtime.c

+8 −11

Original line number	Diff line number	Diff line
		@@ -145,24 +145,21 @@ static void pm_runtime_cancel_pending(struct device *dev)
		u64 pm_runtime_autosuspend_expiration(struct device *dev)
		{
		int autosuspend_delay;
		u64 last_busy, expires = 0;
		u64 now = ktime_get_mono_fast_ns();
		u64 expires;

		if (!dev->power.use_autosuspend)
		goto out;
		return 0;

		autosuspend_delay = READ_ONCE(dev->power.autosuspend_delay);
		if (autosuspend_delay < 0)
		goto out;

		last_busy = READ_ONCE(dev->power.last_busy);
		return 0;

		expires = last_busy + (u64)autosuspend_delay * NSEC_PER_MSEC;
		if (expires <= now)
		expires = 0; /* Already expired. */
		expires = READ_ONCE(dev->power.last_busy);
		expires += (u64)autosuspend_delay * NSEC_PER_MSEC;
		if (expires > ktime_get_mono_fast_ns())
		return expires; /* Expires in the future */

		out:
		return expires;
		return 0;
		}
		EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration);

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