linux-kernel - [PATCH] swsusp: Disable nonboot CPUs before entering platform suspend

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Message-Id: <200703072044.12021.rjw@sisk.pl>
Date:	Wed, 7 Mar 2007 20:44:11 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>
Subject: [PATCH] swsusp: Disable nonboot CPUs before entering platform suspend

From: Rafael J. Wysocki <rjw@...k.pl>

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@...k.pl>
---
 kernel/power/disk.c |    1 +
 kernel/power/user.c |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6.21-rc2-mm2/kernel/power/disk.c
===================================================================
--- linux-2.6.21-rc2-mm2.orig/kernel/power/disk.c
+++ linux-2.6.21-rc2-mm2/kernel/power/disk.c
@@ -61,6 +61,7 @@ static void power_down(suspend_disk_meth
 	switch(mode) {
 	case PM_DISK_PLATFORM:
 		if (pm_ops && pm_ops->enter) {
+			disable_nonboot_cpus();
 			kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
 			pm_ops->enter(PM_SUSPEND_DISK);
 			break;
Index: linux-2.6.21-rc2-mm2/kernel/power/user.c
===================================================================
--- linux-2.6.21-rc2-mm2.orig/kernel/power/user.c
+++ linux-2.6.21-rc2-mm2/kernel/power/user.c
@@ -398,9 +398,9 @@ static int snapshot_ioctl(struct inode *
 
 		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;
 			}
 			break;
 
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