Merge branch 'for_paulus' of master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc

[pandora-kernel.git] / kernel / posix-cpu-timers.c

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 9d9169a..d38d9ec 100644 (file)
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -555,9 +555,6 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
        struct cpu_timer_list *next;
        unsigned long i;
 
-       if (CPUCLOCK_PERTHREAD(timer->it_clock) && (p->flags & PF_EXITING))
-               return;
-
        head = (CPUCLOCK_PERTHREAD(timer->it_clock) ?
                p->cpu_timers : p->signal->cpu_timers);
        head += CPUCLOCK_WHICH(timer->it_clock);
@@ -1288,30 +1285,30 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 
 #undef UNEXPIRED
 
-       BUG_ON(tsk->exit_state);
-
        /*
         * Double-check with locks held.
         */
        read_lock(&tasklist_lock);
-       spin_lock(&tsk->sighand->siglock);
+       if (likely(tsk->signal != NULL)) {
+               spin_lock(&tsk->sighand->siglock);
 
-       /*
-        * Here we take off tsk->cpu_timers[N] and tsk->signal->cpu_timers[N]
-        * all the timers that are firing, and put them on the firing list.
-        */
-       check_thread_timers(tsk, &firing);
-       check_process_timers(tsk, &firing);
+               /*
+                * Here we take off tsk->cpu_timers[N] and tsk->signal->cpu_timers[N]
+                * all the timers that are firing, and put them on the firing list.
+                */
+               check_thread_timers(tsk, &firing);
+               check_process_timers(tsk, &firing);
 
-       /*
-        * We must release these locks before taking any timer's lock.
-        * There is a potential race with timer deletion here, as the
-        * siglock now protects our private firing list.  We have set
-        * the firing flag in each timer, so that a deletion attempt
-        * that gets the timer lock before we do will give it up and
-        * spin until we've taken care of that timer below.
-        */
-       spin_unlock(&tsk->sighand->siglock);
+               /*
+                * We must release these locks before taking any timer's lock.
+                * There is a potential race with timer deletion here, as the
+                * siglock now protects our private firing list.  We have set
+                * the firing flag in each timer, so that a deletion attempt
+                * that gets the timer lock before we do will give it up and
+                * spin until we've taken care of that timer below.
+                */
+               spin_unlock(&tsk->sighand->siglock);
+       }
        read_unlock(&tasklist_lock);
 
        /*