If we set TIF_SIGPENDING for SIGCONT, we have to wake up any sleeping

tasks (even if we don't otherwise need to wake anything up), since
otherwise later signals would see that signals are already pending and
wouldn't cause wakeups.

diff --git a/kernel/signal.c b/kernel/signal.c
index a4d6618f77d06785f5cde986c28c4dfb0a722c44..b43102e63a8d54858c9e31a75fe75ade35bd8847 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -619,6 +619,7 @@ static void handle_stop_signal(int sig, struct task_struct *p)
                rm_from_queue(SIG_KERNEL_STOP_MASK, &p->signal->shared_pending);
                t = p;
                do {
+                       unsigned int state;
                        rm_from_queue(SIG_KERNEL_STOP_MASK, &t->pending);
                        
                        /*
@@ -635,9 +636,12 @@ static void handle_stop_signal(int sig, struct task_struct *p)
                         * Wake up the stopped thread _after_ setting
                         * TIF_SIGPENDING
                         */
-                       if (!sigismember(&t->blocked, SIGCONT))
+                       state = TASK_STOPPED;
+                       if (!sigismember(&t->blocked, SIGCONT)) {
                                set_tsk_thread_flag(t, TIF_SIGPENDING);
-                       wake_up_state(t, TASK_STOPPED);
+                               state |= TASK_INTERRUPTIBLE;
+                       }
+                       wake_up_state(t, state);
 
                        t = next_thread(t);
                } while (t != p);