PM: sleep: Do not let "syscore" devices runtime-suspend during system transitions

There is no reason to allow "syscore" devices to runtime-suspend
during system-wide PM transitions, because they are subject to the
same possible failure modes as any other devices in that respect.

Accordingly, change device_prepare() and device_complete() to call
pm_runtime_get_noresume() and pm_runtime_put(), respectively, for
"syscore" devices too.

Fixes: 057d51a1268f ("Merge branch 'pm-sleep'")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index cbea78e79f3dfae2e6a6a603c60b582cb549131b..fca6eab871fcae5b3bd17ee3eadaa93bf4abfa2a 100644 (file)
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1051,7 +1051,7 @@ static void device_complete(struct device *dev, pm_message_t state)
        const char *info = NULL;
 
        if (dev->power.syscore)
-               return;
+               goto out;
 
        device_lock(dev);
 
@@ -1081,6 +1081,7 @@ static void device_complete(struct device *dev, pm_message_t state)
 
        device_unlock(dev);
 
+out:
        pm_runtime_put(dev);
 }
 
@@ -1794,9 +1795,6 @@ static int device_prepare(struct device *dev, pm_message_t state)
        int (*callback)(struct device *) = NULL;
        int ret = 0;
 
-       if (dev->power.syscore)
-               return 0;
-
        /*
         * If a device's parent goes into runtime suspend at the wrong time,
         * it won't be possible to resume the device.  To prevent this we
@@ -1805,6 +1803,9 @@ static int device_prepare(struct device *dev, pm_message_t state)
         */
        pm_runtime_get_noresume(dev);
 
+       if (dev->power.syscore)
+               return 0;
+
        device_lock(dev);
 
        dev->power.wakeup_path = false;