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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 12:04:55 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 23:37:20 +0200
commitc7e0831d385d620a58d95b25e4afa9b643f9a411 (patch)
treed3dde7c47276aeb6fad0a1f25fa6b74cc5dacfc1 /drivers
parentHibernation: Use temporary page tables for kernel text mapping on x86_64 (diff)
downloadlinux-c7e0831d385d620a58d95b25e4afa9b643f9a411.tar.xz
linux-c7e0831d385d620a58d95b25e4afa9b643f9a411.zip
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 'drivers')
-rw-r--r--drivers/acpi/sleep/main.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index acfb01b8ec82..048295ec3707 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -257,6 +257,15 @@ static int acpi_hibernation_enter(void)
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
+static void acpi_hibernation_leave(void)
+{
+ /*
+ * If ACPI is not enabled by the BIOS and the boot kernel, we need to
+ * enable it here.
+ */
+ acpi_enable();
+}
+
static void acpi_hibernation_finish(void)
{
acpi_leave_sleep_state(ACPI_STATE_S4);
@@ -288,6 +297,7 @@ static struct platform_hibernation_ops acpi_hibernation_ops = {
.finish = acpi_hibernation_finish,
.prepare = acpi_hibernation_prepare,
.enter = acpi_hibernation_enter,
+ .leave = acpi_hibernation_leave,
.pre_restore = acpi_hibernation_pre_restore,
.restore_cleanup = acpi_hibernation_restore_cleanup,
};