Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/linvil...

[linux-drm-fsl-dcu.git] / kernel / signal.c

diff --git a/kernel/signal.c b/kernel/signal.c
index 34b7d6abce8fd786161a2d5517377103d1a4b85b..acdfc0549c6fd88c254f8d07009edcc123804bfb 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -96,15 +96,27 @@ static inline int has_pending_signals(sigset_t *signal, sigset_t *blocked)
 
 #define PENDING(p,b) has_pending_signals(&(p)->signal, (b))
 
-fastcall void recalc_sigpending_tsk(struct task_struct *t)
+static int recalc_sigpending_tsk(struct task_struct *t)
 {
        if (t->signal->group_stop_count > 0 ||
            (freezing(t)) ||
            PENDING(&t->pending, &t->blocked) ||
-           PENDING(&t->signal->shared_pending, &t->blocked))
+           PENDING(&t->signal->shared_pending, &t->blocked)) {
                set_tsk_thread_flag(t, TIF_SIGPENDING);
-       else
-               clear_tsk_thread_flag(t, TIF_SIGPENDING);
+               return 1;
+       }
+       clear_tsk_thread_flag(t, TIF_SIGPENDING);
+       return 0;
+}
+
+/*
+ * After recalculating TIF_SIGPENDING, we need to make sure the task wakes up.
+ * This is superfluous when called on current, the wakeup is a harmless no-op.
+ */
+void recalc_sigpending_and_wake(struct task_struct *t)
+{
+       if (recalc_sigpending_tsk(t))
+               signal_wake_up(t, 0);
 }
 
 void recalc_sigpending(void)
@@ -497,6 +509,11 @@ static int check_kill_permission(int sig, struct siginfo *info,
        int error = -EINVAL;
        if (!valid_signal(sig))
                return error;
+
+       error = audit_signal_info(sig, t); /* Let audit system see the signal */
+       if (error)
+               return error;
+
        error = -EPERM;
        if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
            && ((sig != SIGCONT) ||
@@ -506,10 +523,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
            && !capable(CAP_KILL))
                return error;
 
-       error = security_task_kill(t, info, sig, 0);
-       if (!error)
-               audit_signal_info(sig, t); /* Let audit system see the signal */
-       return error;
+       return security_task_kill(t, info, sig, 0);
 }
 
 /* forward decl */
@@ -742,7 +756,7 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
                action->sa.sa_handler = SIG_DFL;
                if (blocked) {
                        sigdelset(&t->blocked, sig);
-                       recalc_sigpending_tsk(t);
+                       recalc_sigpending_and_wake(t);
                }
        }
        ret = specific_send_sig_info(sig, info, t);
@@ -2271,7 +2285,7 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
                        rm_from_queue_full(&mask, &t->signal->shared_pending);
                        do {
                                rm_from_queue_full(&mask, &t->pending);
-                               recalc_sigpending_tsk(t);
+                               recalc_sigpending_and_wake(t);
                                t = next_thread(t);
                        } while (t != current);
                }