[PATCH 2/2] suspend: Cleanup calling of power off methods.

[ebiederm@xmission.com (Eric W. Biederman)]

In the lead up to 2.6.13 I fixed a large number of reboot
problems by making the calling conventions consistent.  Despite
checking and double checking my work it appears I missed an
obvious one.

The S4 suspend code for PM_DISK_PLATFORM was also calling
device_shutdown without setting system_state, and was
not calling the appropriate reboot_notifier.

This patch fixes the bug by replacing the call of device_suspend with
kernel_poweroff_prepare.  

Various forms of this failure have been fixed and tracked for a while.

Thanks for tracking this down go to: Alexey Starikovskiy,
Meelis Roos <mroos@linux.ee>, Nigel Cunningham <ncunningham@cyclades.com>,
Pierre Ossman <drzeus-list@drzeus.cx>

History of this bug is at:
http://bugme.osdl.org/show_bug.cgi?id=4320

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>


---

 kernel/power/disk.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

2c72ba7b1126a7ccf3e8fc032f041a223e39aa97
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -17,12 +17,12 @@
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/mount.h>
+#include <linux/pm.h>
 
 #include "power.h"
 
 
 extern suspend_disk_method_t pm_disk_mode;
-extern struct pm_ops * pm_ops;
 
 extern int swsusp_suspend(void);
 extern int swsusp_write(void);
@@ -49,13 +49,11 @@ dev_t swsusp_resume_device;
 
 static void power_down(suspend_disk_method_t mode)
 {
-	unsigned long flags;
 	int error = 0;
 
-	local_irq_save(flags);
 	switch(mode) {
 	case PM_DISK_PLATFORM:
- 		device_shutdown();
+		kernel_power_off_prepare();
 		error = pm_ops->enter(PM_SUSPEND_DISK);
 		break;
 	case PM_DISK_SHUTDOWN: