[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>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/power/user.c b/kernel/power/user.c
index dd09efe7df54..d6a8dcc26ae5 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;