[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 a200c5f..873cdf8 100644 (file)
--- 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 dd09efe..d6a8dcc 100644 (file)
--- 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;