From: Rafael J. Wysocki <rjw@sisk.pl>
Date: Fri, 16 Mar 2007 21:38:06 +0000 (-0800)
Subject: [PATCH] swsusp: disable nonboot CPUs before entering platform suspend
X-Git-Tag: v2.6.21-rc5~107
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=94985134b7b46848267ed6b734320db01c974e72;p=linux-2.6

[PATCH] swsusp: disable nonboot CPUs before entering platform suspend

Prevent the WARN_ON() in arch/x86_64/kernel/acpi/sleep.c:init_low_mapping()
from triggering by disabling nonboot CPUs before we finally enter the
platform suspend.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index a200c5fc42..873cdf8ea5 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -58,6 +58,7 @@ static inline int platform_prepare(void)
 
 static void power_down(suspend_disk_method_t mode)
 {
+	disable_nonboot_cpus();
 	switch(mode) {
 	case PM_DISK_PLATFORM:
 		if (pm_ops && pm_ops->enter) {
diff --git a/kernel/power/user.c b/kernel/power/user.c
index dd09efe7df..d6a8dcc26a 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -398,9 +398,10 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 
 		case PMOPS_ENTER:
 			if (data->platform_suspend) {
+				disable_nonboot_cpus();
 				kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
 				error = pm_ops->enter(PM_SUSPEND_DISK);
-				error = 0;
+				enable_nonboot_cpus();
 			}
 			break;