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clockevents: Do not suspend/resume if unused

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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 <sylvain.rochet@finsecur.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1421399151-26800-1-git-send-email-alexandre.belloni@free-electrons.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Alexandre Belloni 2015-01-16 10:05:51 +01:00 • committed by Thomas Gleixner
parent e83d0a4106
commit ac34ad27fc
1 changed files with 2 additions and 2 deletions
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4
kernel/time/clockevents.c
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@ -638,7 +638,7 @@ void clockevents_suspend(void)
struct clock_event_device *dev; struct clock_event_device *dev;
list_for_each_entry_reverse(dev, &clockevent_devices, list) list_for_each_entry_reverse(dev, &clockevent_devices, list)
if (dev->suspend) if (dev->suspend && dev->mode != CLOCK_EVT_MODE_UNUSED)
dev->suspend(dev); dev->suspend(dev);
} }
@ -650,7 +650,7 @@ void clockevents_resume(void)
struct clock_event_device *dev; struct clock_event_device *dev;
list_for_each_entry(dev, &clockevent_devices, list) list_for_each_entry(dev, &clockevent_devices, list)
if (dev->resume) if (dev->resume && dev->mode != CLOCK_EVT_MODE_UNUSED)
dev->resume(dev); dev->resume(dev);
} }