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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 03:04:55 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:20 -0700
commitc7e0831d385d620a58d95b25e4afa9b643f9a411 (patch)
treed3dde7c47276aeb6fad0a1f25fa6b74cc5dacfc1 /kernel/power/power.h
parentefa4d2fb047b25a6be67fe92178a2a78da6b3f6a (diff)
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>
Diffstat (limited to 'kernel/power/power.h')
-rw-r--r--kernel/power/power.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h
index a0204dfc6c4..195dc461176 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -183,7 +183,6 @@ extern int swsusp_swap_in_use(void);
extern int swsusp_check(void);
extern int swsusp_shrink_memory(void);
extern void swsusp_free(void);
-extern int swsusp_suspend(void);
extern int swsusp_resume(void);
extern int swsusp_read(unsigned int *flags_p);
extern int swsusp_write(unsigned int flags);