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-rw-r--r--arch/s390/kernel/smp.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index d52d6d211d9f..2b8841f85534 100644
--- a/arch/s390/kernel/smp.c
+++ b/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();