linux-toradex.git/drivers/rtc/interface.c, branch v3.14.57

rtc: Keep system awake until all expired RTC timers are handled

2013-07-22T16:38:25+00:00

Current implementation of RTC interface allows for system suspend to
occur in the following cases:
(a) if a timer is set in the past and rtc_timer_do_work() is scheduled
to handle it, and
(b) if rtc_timer_do_work() is called to handle expired timers whose
handlers implement a preemption point.

A pending suspend request may be honoured in the above cases causing
timer handling to be delayed until after the next resume. This is
undesirable since timer handlers may have time-critical code to execute.

This patch makes sure that the system stays awake until all expired
timers are handled.

Note that all calls to pm_stay_awake() are eventually paired with
the single pm_relax() call in rtc_timer_do_work(), which is launched
using schedule_work().

Cc: Alessandro Zummo 
Cc: John Stultz 
Cc: Arve Hjonnevag 
Cc: Todd Poynor 
Signed-off-by: Zoran Markovic 
Signed-off-by: John Stultz

drivers/rtc/interface.c: return -EBUSY, not -EACCES when device is busy

2013-07-03T23:08:00+00:00

If rtc->irq_task is non-NULL and task is NULL, they always
rtc_irq_set_freq(), whenever err is set to -EBUSY it will then immediately
be set to -EACCES, misleading the caller as to the underlying problem.

Signed-off-by: Chris Brand 
Acked-by: Alessandro Zummo 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/rtc/interface.c: fix checkpatch errors

2013-07-03T23:07:46+00:00

Fixes the following types of errors:
  ERROR: "foo* bar" should be "foo *bar"
  ERROR: else should follow close brace '}'
  WARNING: braces {} are not necessary for single statement blocks

Signed-off-by: Sachin Kamat 
Cc: Jingoo Han 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

driver-core: constify data for class_find_device()

2013-02-06T20:18:56+00:00

All in-kernel users of class_find_device() don't really need mutable
data for match callback.

In two places (kernel/power/suspend_test.c, drivers/scsi/osd/osd_uld.c)
this patch changes match callbacks to use const search data.

The const is propagated to rtc_class_open() and power_supply_get_by_name()
parameters.

Note that there's a dev reference leak in suspend_test.c that's not
touched in this patch.

Signed-off-by: Michał Mirosław 
Acked-by: Grant Likely 
Signed-off-by: Greg Kroah-Hartman

RTC: Avoid races between RTC alarm wakeup and suspend.

2012-08-08T18:49:16+00:00

If an RTC alarm fires just as suspend is happening, it is possible for
suspend to complete and the alarm to be missed.

To avoid the race, we must register the event with the PM core.

As the event is made visible to userspace through a thread which is
only scheduled by the interrupt, we need a pm_stay_awake/pm_relax
pair preventing suspend from the interrupt until the thread completes
its work.

This makes the pm_wakeup_event() call in cmos_interrupt unnecessary as
it provides suspend protection for all RTCs that use rtc_update_irq.

Signed-off-by: NeilBrown 
Signed-off-by: Rafael J. Wysocki

rtc: Provide flag for rtc devices that don't support UIE

2012-03-16T01:23:10+00:00

Richard Weinberger noticed that on some RTC hardware that
doesn't support UIE mode, due to coarse granular alarms
(like 1minute resolution), the current virtualized RTC
support doesn't properly error out when UIE is enabled.

Instead the current code queues an alarm for the next second,
but it won't fire until up to a miniute later.

This patch provides a generic way to flag this sort of hardware
and fixes the issue on the mpc5121 where Richard noticed the
problem.

CC: stable@vger.kernel.org
Reported-by: Richard Weinberger 
Tested-by: Richard Weinberger 
Signed-off-by: John Stultz

rtc: Disable the alarm in the hardware (v2)

2012-01-27T03:41:42+00:00

Currently, the RTC code does not disable the alarm in the hardware.

This means that after a sequence such as the one below (the files are in the
RTC sysfs), the box will boot up after 2 minutes even though we've
asked for the alarm to be turned off.

	# echo $((`cat since_epoch`)+120) > wakealarm
	# echo 0 > wakealarm
	# poweroff

Fix this by disabling the alarm when there are no timers to run.

The original version of this patch was reverted. This version
disables the irq directly instead of setting a disabled timer
in the future.

Cc: stable@kernel.org
Cc: John Stultz 
Signed-off-by: Rabin Vincent 
[Merged in the second revision from Rabin]
Signed-off-by: John Stultz

rtc: Expire alarms after the time is set. (v2)

2012-01-27T03:41:36+00:00

If the alarm time programming in the rtc is ever in the past, it won't fire,
and any other alarm will be queued after it so they won't fire either.

So any time that the alarm might be in the past, we need to trigger
the irq handler to ensure the old alarm is cleared and the timer queue
is fully in the future.

This is done whenever the RTC clock is set.

This is the second revision of this patch, which was earlier reverted.
This version avoids the initialization problem, which is handled by
a different patch.

Tested-by: Sander Eikelenboom 
Signed-off-by: NeilBrown 
[Remove problematic initialization change, update commit log, also
catch set_mmss case -jstultz]
Signed-off-by: John Stultz

rtc: Avoid setting alarm to a time in the past

2012-01-27T03:41:30+00:00

In some cases at boot up, the RTC alarm may be set in the past,
but still have the enabled flag on. This was causing problems,
because we would then enqueue the alarm into the timerqueue,
but it would never fire. This would clog up the timerqueue
and keep other alarms from working.

The fix is to check the alarm against the current rtc time at
boot and avoid enqueueing the alarm if it is in the past.

Reported-by: NeilBrown 
Tested-by: NeilBrown 
Tested-by: Sander Eikelenboom 
Signed-off-by: John Stultz

drivers/rtc/interface.c: fix alarm rollover when day or month is out-of-range

2012-01-11T00:30:53+00:00

Commit f44f7f96a20a ("RTC: Initialize kernel state from RTC") introduced a
potential infinite loop.  If an alarm time contains a wildcard month and
an invalid day (> 31), or a wildcard year and an invalid month (>= 12),
the loop searching for the next matching date will never terminate.  Treat
the invalid values as wildcards.

Fixes , 

Reported-by: leo weppelman 
Reported-by: "P. van Gaans" 
Signed-off-by: Ben Hutchings 
Signed-off-by: Jonathan Nieder 
Cc: Mark Brown 
Cc: Marcelo Roberto Jimenez 
Cc: Thomas Gleixner 
Cc: John Stultz 
Acked-by: Alessandro Zummo 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds