1 files changed, 25 insertions, 22 deletions

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 383ba22f0b62..bf374fceb39c 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -497,7 +497,7 @@ static void process_timer_rebalance(struct task_struct *p,
                 left = cputime_div(cputime_sub(expires.cpu, val.cpu),
                                    nthreads);
                 do {
-                        if (!unlikely(t->exit_state)) {
+                        if (!unlikely(t->flags & PF_EXITING)) {
                                 ticks = cputime_add(prof_ticks(t), left);
                                 if (cputime_eq(t->it_prof_expires,
                                                cputime_zero) ||
@@ -512,7 +512,7 @@ static void process_timer_rebalance(struct task_struct *p,
                 left = cputime_div(cputime_sub(expires.cpu, val.cpu),
                                    nthreads);
                 do {
-                        if (!unlikely(t->exit_state)) {
+                        if (!unlikely(t->flags & PF_EXITING)) {
                                 ticks = cputime_add(virt_ticks(t), left);
                                 if (cputime_eq(t->it_virt_expires,
                                                cputime_zero) ||
@@ -527,7 +527,7 @@ static void process_timer_rebalance(struct task_struct *p,
                 nsleft = expires.sched - val.sched;
                 do_div(nsleft, nthreads);
                 do {
-                        if (!unlikely(t->exit_state)) {
+                        if (!unlikely(t->flags & PF_EXITING)) {
                                 ns = t->sched_time + nsleft;
                                 if (t->it_sched_expires == 0 ||
                                     t->it_sched_expires > ns) {
@@ -566,6 +566,9 @@ 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);
@@ -1204,7 +1207,7 @@ static void check_process_timers(struct task_struct *tsk,
 
                         do {
                                 t = next_thread(t);
-                        } while (unlikely(t->exit_state));
+                        } while (unlikely(t->flags & PF_EXITING));
                 } while (t != tsk);
         }
 }
@@ -1293,30 +1296,30 @@ 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);
-        if (likely(tsk->signal != NULL)) {
-                spin_lock(&tsk->sighand->siglock);
+        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);
 
         /*