From: Chad Goodman <chad.goodman@gmail.com>
Date: Mon, 10 Dec 2012 06:03:22 +0000 (-0800)
Subject: ARM: disable preemption in machine_shutdown
X-Git-Url: https://ziggy471.com/git/gitweb.cgi?p=ziggy471-sgn2-jb.git;a=commitdiff;h=6e662228ef2fa9074ff1fced87ffa792150ffa78

ARM: disable preemption in machine_shutdown

Signed-off-by: Ziggy <ziggy@ziggy471.com>
---

--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -272,6 +272,15 @@ __setup("reboot=", reboot_setup);
 void machine_shutdown(void)
 {
 #ifdef CONFIG_SMP
+	/*
+	 * Disable preemption so we're guaranteed to
+	 * run to power off or reboot and prevent
+	 * the possibility of switching to another
+	 * thread that might wind up blocking on
+	 * one of the stopped CPUs.
+	 */
+	preempt_disable();
+
 	smp_send_stop();
 #endif
 }