From 699ff13f10b75ea929eea6f6fe47ba9cc8f92ca2 Mon Sep 17 00:00:00 2001
From: Michael Ryan <ryan@funsoft.com>
Date: Fri, 24 Mar 2006 03:15:17 -0800
Subject: [PATCH] s390: cpu up retries

Retry starting of new cpu if sigp restart returns condition code 2 (busy).

Signed-off-by: Michael Ryan <ryan@funsoft.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 arch/s390/kernel/smp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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();
-- 
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