ACPI / PM: Fix problems with acpi_pm_device_sleep_state()

There is a number of problems with acpi_pm_device_sleep_state() now.
First, if _S0W is not defined, it prevents devices from being put
into D3 by PCI runtime PM, which shouldn't happen.  Second, it
shouldn't use adev->wakeup.state.enabled, because if it's set, it
only means that either the device is permanently enabled to wake up
the system, or that it has been enabled to do that through
/proc/acpi/wakeup.  Finally, it should be compiled if CONFIG_PM_SLEEP
is not set, so that PCI runtime PM works correctly in that case.
Fix these problems.

Reported-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 4754ff6e70e6..e807f4196f89 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -27,6 +27,8 @@
 
 u8 sleep_states[ACPI_S_STATE_COUNT];
 
+static u32 acpi_target_sleep_state = ACPI_STATE_S0;
+
 static void acpi_sleep_tts_switch(u32 acpi_state)
 {
         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
@@ -79,8 +81,6 @@ static int acpi_sleep_prepare(u32 acpi_state)
 }
 
 #ifdef CONFIG_ACPI_SLEEP
-static u32 acpi_target_sleep_state = ACPI_STATE_S0;
-
 /*
  * The ACPI specification wants us to save NVS memory regions during hibernation
  * and to restore them during the subsequent resume.  Windows does that also for
@@ -562,7 +562,7 @@ int acpi_suspend(u32 acpi_state)
         return -EINVAL;
 }
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM_OPS
 /**
  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
  *              in the system sleep state given by %acpi_target_sleep_state
@@ -624,7 +624,7 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
          * can wake the system.  _S0W may be valid, too.
          */
         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
-            (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
+            (device_may_wakeup(dev) &&
              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
                 acpi_status status;
 
@@ -632,7 +632,9 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
                                                 &d_max);
                 if (ACPI_FAILURE(status)) {
-                        d_max = d_min;
+                        if (acpi_target_sleep_state != ACPI_STATE_S0 ||
+                            status != AE_NOT_FOUND)
+                                d_max = d_min;
                 } else if (d_max < d_min) {
                         /* Warn the user of the broken DSDT */
                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
@@ -646,7 +648,9 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
                 *d_min_p = d_min;
         return d_max;
 }
+#endif /* CONFIG_PM_OPS */
 
+#ifdef CONFIG_PM_SLEEP
 /**
  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
  *                                  capability of given device
@@ -677,7 +681,7 @@ int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 
         return error;
 }
-#endif
+#endif  /* CONFIG_PM_SLEEP */
 
 static void acpi_power_off_prepare(void)
 {