From: Luca Tettamanti <kronos.it@gmail.com>

When CONFIG_RT_MUTEX_TESTER is enabled kernel refuses to suspend the
machine because it's unable to freeze the rt-test-* threads.

Add try_to_freeze() after schedule() so that the threads will be freezed
correctly; I've tested the patch and it lets the notebook suspends and
resumes nicely.

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/rtmutex-tester.c |    1 +
 1 files changed, 1 insertion(+)

diff -puN kernel/rtmutex-tester.c~add-try_to_freeze-to-rt-test-kthreads kernel/rtmutex-tester.c
--- a/kernel/rtmutex-tester.c~add-try_to_freeze-to-rt-test-kthreads
+++ a/kernel/rtmutex-tester.c
@@ -275,6 +275,7 @@ static int test_func(void *data)
 
 		/* Wait for the next command to be executed */
 		schedule();
+		try_to_freeze();
 
 		if (signal_pending(current))
 			flush_signals(current);
_