From b1457bcc3a00a0446c7f6e2f22fd24b6d8d0a309 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 19 Jul 2007 01:47:31 -0700 Subject: Hibernation: prepare to enter the low power state 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 Cc: Gautham R Shenoy Cc: Pavel Machek Cc: Nigel Cunningham Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/disk.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'kernel/power') diff --git a/kernel/power/disk.c b/kernel/power/disk.c index 77ac605bf20..885c653509c 100644 --- a/kernel/power/disk.c +++ b/kernel/power/disk.c @@ -205,12 +205,23 @@ int hibernation_restore(int platform_mode) int hibernation_platform_enter(void) { + int error; + if (hibernation_ops) { 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 { - return -ENOSYS; + error = -ENOSYS; } + return error; } /** -- cgit v1.2.3-70-g09d2