[RFC][PATCH -mm] Freezer: Do not allow freezing processes to clear TIF_SIGPENDING

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@xxxxxxx>

Do not allow processes to clear their TIF_SIGPENDING if TIF_FREEZE is set,
to prevent them from racing with the freezer (like mysqld does, for example).

Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
 kernel/signal.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.23-mm1/kernel/signal.c
===================================================================
--- linux-2.6.23-mm1.orig/kernel/signal.c
+++ linux-2.6.23-mm1/kernel/signal.c
@@ -124,7 +124,7 @@ void recalc_sigpending_and_wake(struct t
 
 void recalc_sigpending(void)
 {
-	if (!recalc_sigpending_tsk(current))
+	if (!recalc_sigpending_tsk(current) && !freezing(current))
 		clear_thread_flag(TIF_SIGPENDING);
 
 }
-
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