Fix ThinkPad T42 poweroff failure introduced by by "PM: Introduce pm_power_off_prepare"

Commit bd804eba1c8597cbb7cd5a5f9fe886aae16a079a ("PM: Introduce
pm_power_off_prepare") caused problems in the poweroff path, as reported by
YOSHIFUJI Hideaki / 吉藤英明.

Generally, sysdev_shutdown() should be called after the ACPI preparation for
powering the system off.  To make it happen, we can separate sysdev_shutdown()
from device_shutdown() and call it directly wherever necessary.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Tested-by: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 7 insertions, 2 deletions

diff --git a/drivers/base/power/shutdown.c b/drivers/base/power/shutdown.c
index a47ee1b70d20..56e8eaaac012 100644
--- a/drivers/base/power/shutdown.c
+++ b/drivers/base/power/shutdown.c
@@ -44,7 +44,5 @@ void device_shutdown(void)
                         dev->driver->shutdown(dev);
                 }
         }
-
-        sysdev_shutdown();
 }
 
diff --git a/include/linux/device.h b/include/linux/device.h
index d9f0a57f5a2f..3a38d1f70cb7 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -551,6 +551,9 @@ extern void put_device(struct device * dev);
 /* drivers/base/power/shutdown.c */
 extern void device_shutdown(void);
 
+/* drivers/base/sys.c */
+extern void sysdev_shutdown(void);
+
 
 /* drivers/base/firmware.c */
 extern int __must_check firmware_register(struct kset *);
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 324ac0188ce1..eb72255b5c86 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -216,6 +216,7 @@ int hibernation_platform_enter(void)
                  * sleep state after all
                  */
                 error = hibernation_ops->prepare();
+                sysdev_shutdown();
                 if (!error)
                         error = hibernation_ops->enter();
         } else {
diff --git a/kernel/sys.c b/kernel/sys.c
index 08562f419768..14f8adcfffd9 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -804,6 +804,7 @@ static void kernel_restart_prepare(char *cmd)
         blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
         system_state = SYSTEM_RESTART;
         device_shutdown();
+        sysdev_shutdown();
 }
 
 /**
@@ -860,6 +861,7 @@ void kernel_shutdown_prepare(enum system_states state)
 void kernel_halt(void)
 {
         kernel_shutdown_prepare(SYSTEM_HALT);
+        sysdev_shutdown();
         printk(KERN_EMERG "System halted.\n");
         machine_halt();
 }
@@ -876,6 +878,7 @@ void kernel_power_off(void)
         kernel_shutdown_prepare(SYSTEM_POWER_OFF);
         if (pm_power_off_prepare)
                 pm_power_off_prepare();
+        sysdev_shutdown();
         printk(KERN_EMERG "Power down.\n");
         machine_power_off();
 }