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>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
drivers/acpi/sleep/main.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 2cbb9aa..caf8721 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -256,6 +256,11 @@ 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);
--
1.5.3.4.206.g58ba4
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