clockevents: Do not suspend/resume if unused

There is no point in calling suspend/resume for unused clockevents as
they are already stopped and disabled.

This is really important for AT91 as the hardware is a trainwreck and
takes ages to synchronize.

Reported-by: Sylvain Rochet <[email protected]>
Signed-off-by: Alexandre Belloni <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/1421399151-26800-1-git-send-email-alexandre.belloni@free-electrons.com
Signed-off-by: Thomas Gleixner <[email protected]>

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 4922f1b805ea8f8b764879bc7a721539a94ce4a8..2a5c369e50ab4244c237d51b33e9efd399d0bb74 100644 (file)
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -638,7 +638,7 @@ void clockevents_suspend(void)
        struct clock_event_device *dev;
 
        list_for_each_entry_reverse(dev, &clockevent_devices, list)
-               if (dev->suspend)
+               if (dev->suspend && dev->mode != CLOCK_EVT_MODE_UNUSED)
                        dev->suspend(dev);
 }
 
@@ -650,7 +650,7 @@ void clockevents_resume(void)
        struct clock_event_device *dev;
 
        list_for_each_entry(dev, &clockevent_devices, list)
-               if (dev->resume)
+               if (dev->resume && dev->mode != CLOCK_EVT_MODE_UNUSED)
                        dev->resume(dev);
 }