PM / Runtime: Fix pm_runtime_suspended()
There are some situations (e.g. in __pm_generic_call()), where
pm_runtime_suspended() is used to decide whether or not to execute
a device's (system) ->suspend() callback. The callback is not
executed if pm_runtime_suspended() returns true, but it does so
for devices that don't even support runtime PM, because the
power.disable_depth device field is ignored by it. This leads to
problems (i.e. devices are not suspened when they should), so rework
pm_runtime_suspended() so that it returns false if the device's
power.disable_depth field is different from zero.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: stable@kernel.org
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 3ec2358..d19f1cc 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -77,7 +77,8 @@
static inline bool pm_runtime_suspended(struct device *dev)
{
- return dev->power.runtime_status == RPM_SUSPENDED;
+ return dev->power.runtime_status == RPM_SUSPENDED
+ && !dev->power.disable_depth;
}
static inline void pm_runtime_mark_last_busy(struct device *dev)