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authorRafael J. Wysocki <rjw@sisk.pl>2007-07-19 01:47:31 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:42 -0700
commitb1457bcc3a00a0446c7f6e2f22fd24b6d8d0a309 (patch)
tree57b25b23e861ce5d0aa4e0ddc0a69ed405ae4701 /kernel/power
parent10a1803d667e209914eaada9b95525252f23ec78 (diff)
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 <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>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/disk.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 77ac605bf20a..885c653509c9 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;
}
/**