From: Rafael J. Wysocki <rjw@xxxxxxx>
If the BIOS does not enable ACPI and the "acpi=off" command line parameter is
passed to the boot kernel, ACPI may be disabled when the (restored) image kernel
attempts to execute acpi_hibernation_finish(). To prevent this from happening
we can call acpi_enable() from acpi_hibernation_finish() (if ACPI is already
enabled, this will have no effect).
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxx>
---
drivers/acpi/sleep/main.c | 5 +++++
1 file changed, 5 insertions(+)
Index: linux-2.6.23-rc3/drivers/acpi/sleep/main.c
===================================================================
--- linux-2.6.23-rc3.orig/drivers/acpi/sleep/main.c
+++ linux-2.6.23-rc3/drivers/acpi/sleep/main.c
@@ -240,6 +240,11 @@ static int acpi_hibernation_enter(void)
static void acpi_hibernation_finish(void)
{
+ /*
+ * If ACPI is not enabled by the BIOS and the boot kernel, we need to
+ * enable it here.
+ */
+ acpi_enable();
acpi_leave_sleep_state(ACPI_STATE_S4);
acpi_disable_wakeup_device(ACPI_STATE_S4);
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