From 6c9c4f2d1033aba201406f5854f1837ef9e94c4c Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Thu, 2 Dec 2010 09:53:54 +0000
Subject: [PATCH] --- yaml --- r: 225877 b: refs/heads/master c:
 28e18293cf0f8d23a0950d7b1d2212d11af494dc h: refs/heads/master i:   225875:
 6a826e1602e4a202727a742c795f101511d4e2d1 v: v3

---
 [refs]                      |  2 +-
 trunk/arch/arm/kernel/smp.c | 18 +++++++++++++++---
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/[refs] b/[refs]
index b0af51bbeb73..b54527f4d367 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0eb0511d176534674600a1986c3c766756288908
+refs/heads/master: 28e18293cf0f8d23a0950d7b1d2212d11af494dc
diff --git a/trunk/arch/arm/kernel/smp.c b/trunk/arch/arm/kernel/smp.c
index 1de3e13a42a1..64f2d198c764 100644
--- a/trunk/arch/arm/kernel/smp.c
+++ b/trunk/arch/arm/kernel/smp.c
@@ -575,10 +575,22 @@ void smp_send_reschedule(int cpu)
 
 void smp_send_stop(void)
 {
-	cpumask_t mask = cpu_online_map;
-	cpu_clear(smp_processor_id(), mask);
-	if (!cpus_empty(mask))
+	unsigned long timeout;
+
+	if (num_online_cpus() > 1) {
+		cpumask_t mask = cpu_online_map;
+		cpu_clear(smp_processor_id(), mask);
+
 		smp_cross_call(&mask, IPI_CPU_STOP);
+	}
+
+	/* Wait up to one second for other CPUs to stop */
+	timeout = USEC_PER_SEC;
+	while (num_online_cpus() > 1 && timeout--)
+		udelay(1);
+
+	if (num_online_cpus() > 1)
+		pr_warning("SMP: failed to stop secondary CPUs\n");
 }
 
 /*