1 files changed, 17 insertions, 36 deletions

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 197208b3aa2a..216f574b5ffb 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -194,9 +194,7 @@ static inline int common_clock_set(const clockid_t which_clock,
 
 static int common_timer_create(struct k_itimer *new_timer)
 {
-        hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock);
-        new_timer->it.real.timer.data = new_timer;
-        new_timer->it.real.timer.function = posix_timer_fn;
+        hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
         return 0;
 }
 
@@ -290,7 +288,8 @@ void do_schedule_next_timer(struct siginfo *info)
                 info->si_overrun = timr->it_overrun_last;
         }
 
-        unlock_timer(timr, flags);
+        if (timr)
+                unlock_timer(timr, flags);
 }
 
 int posix_timer_event(struct k_itimer *timr,int si_private)
@@ -692,6 +691,7 @@ common_timer_set(struct k_itimer *timr, int flags,
                  struct itimerspec *new_setting, struct itimerspec *old_setting)
 {
         struct hrtimer *timer = &timr->it.real.timer;
+        enum hrtimer_mode mode;
 
         if (old_setting)
                 common_timer_get(timr, old_setting);
@@ -713,14 +713,10 @@ common_timer_set(struct k_itimer *timr, int flags,
         if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec)
                 return 0;
 
-        /* Posix madness. Only absolute CLOCK_REALTIME timers
-         * are affected by clock sets. So we must reiniatilize
-         * the timer.
-         */
-        if (timr->it_clock == CLOCK_REALTIME && (flags & TIMER_ABSTIME))
-                hrtimer_rebase(timer, CLOCK_REALTIME);
-        else
-                hrtimer_rebase(timer, CLOCK_MONOTONIC);
+        mode = flags & TIMER_ABSTIME ? HRTIMER_ABS : HRTIMER_REL;
+        hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
+        timr->it.real.timer.data = timr;
+        timr->it.real.timer.function = posix_timer_fn;
 
         timer->expires = timespec_to_ktime(new_setting->it_value);
 
@@ -728,11 +724,15 @@ common_timer_set(struct k_itimer *timr, int flags,
         timr->it.real.interval = timespec_to_ktime(new_setting->it_interval);
 
         /* SIGEV_NONE timers are not queued ! See common_timer_get */
-        if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE))
+        if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) {
+                /* Setup correct expiry time for relative timers */
+                if (mode == HRTIMER_REL)
+                        timer->expires = ktime_add(timer->expires,
+                                                   timer->base->get_time());
                 return 0;
+        }
 
-        hrtimer_start(timer, timer->expires, (flags & TIMER_ABSTIME) ?
-                      HRTIMER_ABS : HRTIMER_REL);
+        hrtimer_start(timer, timer->expires, mode);
         return 0;
 }
 
@@ -875,12 +875,6 @@ int do_posix_clock_nosettime(const clockid_t clockid, struct timespec *tp)
 }
 EXPORT_SYMBOL_GPL(do_posix_clock_nosettime);
 
-int do_posix_clock_notimer_create(struct k_itimer *timer)
-{
-        return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(do_posix_clock_notimer_create);
-
 int do_posix_clock_nonanosleep(const clockid_t clock, int flags,
                                struct timespec *t, struct timespec __user *r)
 {
@@ -947,21 +941,8 @@ sys_clock_getres(const clockid_t which_clock, struct timespec __user *tp)
 static int common_nsleep(const clockid_t which_clock, int flags,
                          struct timespec *tsave, struct timespec __user *rmtp)
 {
-        int mode = flags & TIMER_ABSTIME ? HRTIMER_ABS : HRTIMER_REL;
-        int clockid = which_clock;
-
-        switch (which_clock) {
-        case CLOCK_REALTIME:
-                /* Posix madness. Only absolute timers on clock realtime
-                   are affected by clock set. */
-                if (mode != HRTIMER_ABS)
-                        clockid = CLOCK_MONOTONIC;
-        case CLOCK_MONOTONIC:
-                break;
-        default:
-                return -EINVAL;
-        }
-        return hrtimer_nanosleep(tsave, rmtp, mode, clockid);
+        return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ?
+                                 HRTIMER_ABS : HRTIMER_REL, which_clock);
 }
 
 asmlinkage long