ACPI / Wakeup: Simplify enabling of wakeup devices

To simplify the enabling of wakeup devices during system suspend and
hibernation, merge acpi_enable_wakeup_device_prep() with
acpi_disable_wakeup_device() and remove unnecessary (and no longer
valid) comments from the latter.  Rename acpi_enable_wakeup_device()
to acpi_enable_wakeup_devices() and acpi_disable_wakeup_device()
to acpi_disable_wakeup_devices(), because these functions usually
operate on multiple device objects.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 14 insertions, 44 deletions

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 8704ca78a8c4..93441c95c53b 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -73,8 +73,7 @@ static int acpi_sleep_prepare(u32 acpi_state)
 #endif
         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
                 acpi_state);
-        acpi_enable_wakeup_device_prep(acpi_state);
-        acpi_enable_wakeup_device(acpi_state);
+        acpi_enable_wakeup_devices(acpi_state);
         acpi_enter_sleep_state_prep(acpi_state);
         return 0;
 }
@@ -153,7 +152,7 @@ static void acpi_pm_finish(void)
 
         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
                 acpi_state);
-        acpi_disable_wakeup_device(acpi_state);
+        acpi_disable_wakeup_devices(acpi_state);
         acpi_leave_sleep_state(acpi_state);
 
         /* reset firmware waking vector */
diff --git a/drivers/acpi/sleep.h b/drivers/acpi/sleep.h
index 25b8bd149284..d8821805c3bc 100644
--- a/drivers/acpi/sleep.h
+++ b/drivers/acpi/sleep.h
@@ -2,9 +2,8 @@
 extern u8 sleep_states[];
 extern int acpi_suspend(u32 state);
 
-extern void acpi_enable_wakeup_device_prep(u8 sleep_state);
-extern void acpi_enable_wakeup_device(u8 sleep_state);
-extern void acpi_disable_wakeup_device(u8 sleep_state);
+extern void acpi_enable_wakeup_devices(u8 sleep_state);
+extern void acpi_disable_wakeup_devices(u8 sleep_state);
 
 extern struct list_head acpi_wakeup_device_list;
 extern struct mutex acpi_device_lock;
diff --git a/drivers/acpi/wakeup.c b/drivers/acpi/wakeup.c
index 388747a7ef4f..dc6d1d9112fb 100644
--- a/drivers/acpi/wakeup.c
+++ b/drivers/acpi/wakeup.c
@@ -21,46 +21,18 @@
 ACPI_MODULE_NAME("wakeup_devices")
 
 /**
- * acpi_enable_wakeup_device_prep - Prepare wake-up devices.
+ * acpi_enable_wakeup_devices - Enable wake-up device GPEs.
  * @sleep_state: ACPI system sleep state.
  *
- * Enable all wake-up devices' power, unless the requested system sleep state is
- * too deep.
+ * Enable wakeup device power of devices with the state.enable flag set and set
+ * the wakeup enable mask bits in the GPE registers that correspond to wakeup
+ * devices.
  */
-void acpi_enable_wakeup_device_prep(u8 sleep_state)
+void acpi_enable_wakeup_devices(u8 sleep_state)
 {
         struct list_head *node, *next;
 
         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
-                struct acpi_device *dev = container_of(node,
-                                                       struct acpi_device,
-                                                       wakeup_list);
-
-                if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
-                    || (sleep_state > (u32) dev->wakeup.sleep_state))
-                        continue;
-
-                acpi_enable_wakeup_device_power(dev, sleep_state);
-        }
-}
-
-/**
- * acpi_enable_wakeup_device - Enable wake-up device GPEs.
- * @sleep_state: ACPI system sleep state.
- *
- * Enable all wake-up devices' GPEs, with the assumption that
- * acpi_disable_all_gpes() was executed before, so we don't need to disable any
- * GPEs here.
- */
-void acpi_enable_wakeup_device(u8 sleep_state)
-{
-        struct list_head *node, *next;
-
-        /* 
-         * Caution: this routine must be invoked when interrupt is disabled 
-         * Refer ACPI2.0: P212
-         */
-        list_for_each_safe(node, next, &acpi_wakeup_device_list) {
                 struct acpi_device *dev =
                         container_of(node, struct acpi_device, wakeup_list);
 
@@ -68,6 +40,9 @@ void acpi_enable_wakeup_device(u8 sleep_state)
                     || sleep_state > (u32) dev->wakeup.sleep_state)
                         continue;
 
+                if (dev->wakeup.state.enabled)
+                        acpi_enable_wakeup_device_power(dev, sleep_state);
+
                 /* The wake-up power should have been enabled already. */
                 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
                                 ACPI_GPE_TYPE_WAKE);
@@ -75,13 +50,10 @@ void acpi_enable_wakeup_device(u8 sleep_state)
 }
 
 /**
- * acpi_disable_wakeup_device - Disable devices' wakeup capability.
+ * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
  * @sleep_state: ACPI system sleep state.
- *
- * This function only affects devices with wakeup.state.enabled set, which means
- * that it reverses the changes made by acpi_enable_wakeup_device_prep().
  */
-void acpi_disable_wakeup_device(u8 sleep_state)
+void acpi_disable_wakeup_devices(u8 sleep_state)
 {
         struct list_head *node, *next;