linux-kernel - [PATCH 6/9] kernel/power/suspend.c,hibernate.c: Don't hibernate/suspend if CPU0 is offline

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Date:	Fri,  4 Nov 2011 15:03:58 -0700
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"Thomas Gleixner" <tglx@...utronix.de>,
	"H Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Tony Luck" <tony.luck@...el.com>,
	"Suresh B Siddha" <suresh.b.siddha@...el.com>,
	"Len Brown" <len.brown@...el.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH 6/9] kernel/power/suspend.c,hibernate.c: Don't hibernate/suspend if CPU0 is offline

From: Fenghua Yu <fenghua.yu@...el.com>

Because x86 BIOS requires CPU0 to resume from sleep, suspend/resume or hibernate
can't be executed if CPU0 is detected offline.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 kernel/power/hibernate.c |    5 +++++
 kernel/power/main.c      |    5 +++++
 kernel/power/suspend.c   |    4 ++++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 1c53f7f..b9d1a37 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -612,6 +612,11 @@ int hibernate(void)
 	int error;
 
 	mutex_lock(&pm_mutex);
+
+	error = arch_state_check();
+	if (error)
+		goto Unlock;
+
 	/* The snapshot device should not be opened while we're running */
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
 		error = -EBUSY;
diff --git a/kernel/power/main.c b/kernel/power/main.c
index a52e884..863d05d 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -447,4 +447,9 @@ static int __init pm_init(void)
 	return sysfs_create_group(power_kobj, &attr_group);
 }
 
+int __weak arch_state_check(void)
+{
+	return 0;
+}
+
 core_initcall(pm_init);
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index fdd4263..f86ff6b 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -284,6 +284,10 @@ int enter_state(suspend_state_t state)
 	if (!mutex_trylock(&pm_mutex))
 		return -EBUSY;
 
+	error = arch_state_check();
+	if (error)
+		goto Unlock;
+
 	printk(KERN_INFO "PM: Syncing filesystems ... ");
 	sys_sync();
 	printk("done.\n");
-- 
1.6.0.3

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