Revert "remove false BUG_ON() from run_posix_cpu_timers()"

[safe/jmp/linux-2.6] / kernel / posix-cpu-timers.c

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 383ba22..ea1aca5 100644 (file)
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -1293,30 +1293,30 @@ 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);
 
        /*