Hibernation: Check if ACPI is enabled during restore in the right place
The following scenario leads to total confusion of the platform firmware on
some boxes (eg. HPC nx6325):
* Hibernate with ACPI enabled
* Resume passing "acpi=off" to the boot kernel
To prevent this from happening it's necessary to check if ACPI is enabled (and
enable it if that's not the case) _right_ _after_ control has been transfered
from the boot kernel to the image kernel, before device_power_up() is called
(ie. with interrupts disabled). Enabling ACPI after calling
device_power_up() turns out to be insufficient.
For this reason, introduce new hibernation callback ->leave() that will be
executed before device_power_up() by the restored image kernel. To make it
work, it also is necessary to move swsusp_suspend() from swsusp.c to disk.c
(it's name is changed to "create_image", which is more up to the point).
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 9fd2b9a..4360e08 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -156,6 +156,12 @@
* Called after the nonboot CPUs have been disabled and all of the low
* level devices have been shut down (runs with IRQs off).
*
+ * @leave: Perform the first stage of the cleanup after the system sleep state
+ * indicated by @set_target() has been left.
+ * Called right after the control has been passed from the boot kernel to
+ * the image kernel, before the nonboot CPUs are enabled and before devices
+ * are resumed. Executed with interrupts disabled.
+ *
* @pre_restore: Prepare system for the restoration from a hibernation image.
* Called right after devices have been frozen and before the nonboot
* CPUs are disabled (runs with IRQs on).
@@ -170,6 +176,7 @@
void (*finish)(void);
int (*prepare)(void);
int (*enter)(void);
+ void (*leave)(void);
int (*pre_restore)(void);
void (*restore_cleanup)(void);
};