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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2007-07-19 01:47:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-19 10:04:42 -0700 |
| commit | b1457bcc3a00a0446c7f6e2f22fd24b6d8d0a309 (patch) | |
| tree | 57b25b23e861ce5d0aa4e0ddc0a69ed405ae4701 /kernel | |
| parent | 10a1803d667e209914eaada9b95525252f23ec78 (diff) | |
| download | linux-b1457bcc3a00a0446c7f6e2f22fd24b6d8d0a309.tar.gz | |
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')
| -rw-r--r-- | kernel/power/disk.c | 15 |
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; } /** |