diff options
| author | John Stultz <john.stultz@linaro.org> | 2012-09-13 19:12:16 -0400 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2012-09-24 12:38:02 -0400 |
| commit | dae373be9fec6f850159a05af3a1c36236a70d43 (patch) | |
| tree | 4a58f2fd66b2cbee680dfd3b83d78e1cfea34128 /include/linux | |
| parent | 59a93c27c4892f04dfd8f91f8b64d0d6eae43e6e (diff) | |
alarmtimer: Use hrtimer per-alarm instead of per-base
Arve Hjønnevåg reported numerous crashes from the
"BUG_ON(timer->state != HRTIMER_STATE_CALLBACK)" check
in __run_hrtimer after it called alarmtimer_fired.
It ends up the alarmtimer code was not properly handling
possible failures of hrtimer_try_to_cancel, and because
these faulres occur when the underlying base hrtimer is
being run, this limits the ability to properly handle
modifications to any alarmtimers on that base.
Because much of the logic duplicates the hrtimer logic,
it seems that we might as well have a per-alarmtimer
hrtimer, and avoid the extra complextity of trying to
multiplex many alarmtimers off of one hrtimer.
Thus this patch moves the hrtimer to the alarm structure
and simplifies the management logic.
Changelog:
v2:
* Includes a fix for double alarm_start calls found by
Arve
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Colin Cross <ccross@android.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Arve Hjønnevåg <arve@android.com>
Tested-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/alarmtimer.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h index 96c5c249b086..f122c9fbf8c7 100644 --- a/include/linux/alarmtimer.h +++ b/include/linux/alarmtimer.h @@ -35,6 +35,7 @@ enum alarmtimer_restart { */ struct alarm { struct timerqueue_node node; + struct hrtimer timer; enum alarmtimer_restart (*function)(struct alarm *, ktime_t now); enum alarmtimer_type type; int state; @@ -43,7 +44,7 @@ struct alarm { void alarm_init(struct alarm *alarm, enum alarmtimer_type type, enum alarmtimer_restart (*function)(struct alarm *, ktime_t)); -void alarm_start(struct alarm *alarm, ktime_t start); +int alarm_start(struct alarm *alarm, ktime_t start); int alarm_try_to_cancel(struct alarm *alarm); int alarm_cancel(struct alarm *alarm); |