linux-kernel - [PATCH] swsusp: Fix SNAPSHOT

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Message-Id: <200703202248.08665.rjw@sisk.pl>
Date:	Tue, 20 Mar 2007 22:48:08 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] swsusp: Fix SNAPSHOT_S2RAM ioctl

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

The SNAPSHOT_S2RAM ioctl does not disable the nonboot CPUs before entering
the suspend, although it should do this.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 kernel/power/user.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

Index: linux-2.6.21-rc4/kernel/power/user.c
===================================================================
--- linux-2.6.21-rc4.orig/kernel/power/user.c
+++ linux-2.6.21-rc4/kernel/power/user.c
@@ -374,9 +374,12 @@ static int snapshot_ioctl(struct inode *
 		if (error) {
 			printk(KERN_ERR "Failed to suspend some devices.\n");
 		} else {
-			/* Enter S3, system is already frozen */
-			suspend_enter(PM_SUSPEND_MEM);
-
+			error = disable_nonboot_cpus();
+			if (!error) {
+				/* Enter S3, system is already frozen */
+				suspend_enter(PM_SUSPEND_MEM);
+				enable_nonboot_cpus();
+			}
 			/* Wake up devices */
 			device_resume();
 		}
-
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