diff --git a/[refs] b/[refs]
index 8944db033efe..67d144dc2d57 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4896cef8e33e668734234543afb58eb171476ff3
+refs/heads/master: 699ff13f10b75ea929eea6f6fe47ba9cc8f92ca2
diff --git a/trunk/arch/s390/kernel/smp.c b/trunk/arch/s390/kernel/smp.c
index d52d6d211d9f..2b8841f85534 100644
--- a/trunk/arch/s390/kernel/smp.c
+++ b/trunk/arch/s390/kernel/smp.c
@@ -665,7 +665,9 @@ __cpu_up(unsigned int cpu)
         cpu_lowcore->current_task = (unsigned long) idle;
         cpu_lowcore->cpu_data.cpu_nr = cpu;
 	eieio();
-	signal_processor(cpu,sigp_restart);
+
+	while (signal_processor(cpu,sigp_restart) == sigp_busy)
+		udelay(10);
 
 	while (!cpu_online(cpu))
 		cpu_relax();