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Hibernation: prepare to enter the low power state

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During hibernation we call hibernation_ops->prepare() before creating the image,
but then, before saving it, we cancel the power transition by calling
hibernation_ops->finish().  Thus prior to calling hibernation_ops->enter() we
should let the platform firmware know that we're going to enter the low power
state after all.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki 2007-07-19 01:47:31 -07:00 committed by Linus Torvalds
parent 10a1803d66
commit b1457bcc3a
1 changed files with 13 additions and 2 deletions
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15
kernel/power/disk.c
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@ -205,12 +205,23 @@ int hibernation_restore(int platform_mode)
int hibernation_platform_enter(void) int hibernation_platform_enter(void)
{ {
int error;
if (hibernation_ops) { if (hibernation_ops) {
kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK); kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
return hibernation_ops->enter(); /*
* We have cancelled the power transition by running
* hibernation_ops->finish() before saving the image, so we
* should let the firmware know that we're going to enter the
* sleep state after all
*/
error = hibernation_ops->prepare();
if (!error)
error = hibernation_ops->enter();
} else { } else {
return -ENOSYS; error = -ENOSYS;
} }
return error;
} }
/** /**