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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull timer fix from Thomas Gleixner:
 "A single fix for a long standing issue in the alarm timer subsystem,
  which was noticed recently when people finally started to use alarm
  timers for serious work"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  alarmtimer: Fix bug where relative alarm timers were treated as absolute
This commit is contained in:
Linus Torvalds 2014-07-19 06:25:03 -10:00
parent da5b99b454 16927776ae
commit b495c23cd4
1 changed files with 18 additions and 2 deletions
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20
kernel/time/alarmtimer.c
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@ -585,9 +585,14 @@ static int alarm_timer_set(struct k_itimer *timr, int flags,
struct itimerspec *new_setting,
struct itimerspec *old_setting)
{
ktime_t exp;
if (!rtcdev)
return -ENOTSUPP;
if (flags & ~TIMER_ABSTIME)
return -EINVAL;
if (old_setting)
alarm_timer_get(timr, old_setting);
@ -597,8 +602,16 @@ static int alarm_timer_set(struct k_itimer *timr, int flags,
/* start the timer */
timr->it.alarm.interval = timespec_to_ktime(new_setting->it_interval);
alarm_start(&timr->it.alarm.alarmtimer,
timespec_to_ktime(new_setting->it_value));
exp = timespec_to_ktime(new_setting->it_value);
/* Convert (if necessary) to absolute time */
if (flags != TIMER_ABSTIME) {
ktime_t now;
now = alarm_bases[timr->it.alarm.alarmtimer.type].gettime();
exp = ktime_add(now, exp);
}
alarm_start(&timr->it.alarm.alarmtimer, exp);
return 0;
}
@ -730,6 +743,9 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
if (!alarmtimer_get_rtcdev())
return -ENOTSUPP;
if (flags & ~TIMER_ABSTIME)
return -EINVAL;
if (!capable(CAP_WAKE_ALARM))
return -EPERM;