From 63c94801701abfea21570d3302687ec027ed33e8 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Thu, 3 Dec 2009 20:22:34 +0100 Subject: PM / Runtime: Use deferred_resume flag in pm_request_resume This patch (as1307) adds a small optimization to __pm_request_resume(). If the device is currently being suspended, there's no need to queue a work routine to resume it. Setting the deferred_resume flag will suffice. (There's also a minor improvement to the function's code layout: An unnecessary "else" is removed.) Also, the patch clarifies the usage of the deferred_resume flag. It is meaningful only while a suspend is in progress, so it should be cleared just before a suspend starts, not just after one ends. Signed-off-by: Alan Stern Signed-off-by: Rafael J. Wysocki --- drivers/base/power/runtime.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'drivers/base') diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 0a4b75f834c..6e8577d1f75 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -185,6 +185,7 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq) } dev->power.runtime_status = RPM_SUSPENDING; + dev->power.deferred_resume = false; if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) { spin_unlock_irq(&dev->power.lock); @@ -200,7 +201,6 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq) if (retval) { dev->power.runtime_status = RPM_ACTIVE; pm_runtime_cancel_pending(dev); - dev->power.deferred_resume = false; if (retval == -EAGAIN || retval == -EBUSY) { notify = true; @@ -217,7 +217,6 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq) wake_up_all(&dev->power.wait_queue); if (dev->power.deferred_resume) { - dev->power.deferred_resume = false; __pm_runtime_resume(dev, false); retval = -EAGAIN; goto out; @@ -659,13 +658,17 @@ static int __pm_request_resume(struct device *dev) pm_runtime_deactivate_timer(dev); + if (dev->power.runtime_status == RPM_SUSPENDING) { + dev->power.deferred_resume = true; + return retval; + } if (dev->power.request_pending) { /* If non-resume request is pending, we can overtake it. */ dev->power.request = retval ? RPM_REQ_NONE : RPM_REQ_RESUME; return retval; - } else if (retval) { - return retval; } + if (retval) + return retval; dev->power.request = RPM_REQ_RESUME; dev->power.request_pending = true; -- cgit v1.2.3