From fe7450b05fddebd5a76a5ad280a5ae9a82ce336f Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 29 Jun 2016 02:53:48 +0200 Subject: [PATCH] PM / runtime: Asynchronous "idle" in pm_runtime_allow() Arjan reports that it takes a relatively long time to enable runtime PM for multiple devices at system startup, because all writes to the "control" attribute in sysfs are handled synchronously and if the device is suspended as a result of the write, it will block until that operation is complete. That may be avoided by passing the RPM_ASYNC flag to rpm_idle() in pm_runtime_allow() which will make it execute the device's "idle" callback asynchronously, so writes to "control" changing it from "on" to "auto" will return without waiting. Reported-by: Arjan van de Ven Signed-off-by: Rafael J. Wysocki Acked-by: Alan Stern Reviewed-by: Ulf Hansson Reviewed-by: Kevin Hilman --- drivers/base/power/runtime.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index e7ee8293055b..aa3ea5e25377 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1260,7 +1260,7 @@ void pm_runtime_allow(struct device *dev) dev->power.runtime_auto = true; if (atomic_dec_and_test(&dev->power.usage_count)) - rpm_idle(dev, RPM_AUTO); + rpm_idle(dev, RPM_AUTO | RPM_ASYNC); out: spin_unlock_irq(&dev->power.lock); -- 2.20.1