PM / runtime: print error when activating a child to unactive parent

[deliverable/linux.git] / drivers / base / power / runtime.c

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index b746904185045a9092865030006f28350c9a9916..e7ee8293055b5c9a4fdfbc05c749ce8b794d0750 100644 (file)
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1045,10 +1045,14 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
                 */
                if (!parent->power.disable_depth
                    && !parent->power.ignore_children
-                   && parent->power.runtime_status != RPM_ACTIVE)
+                   && parent->power.runtime_status != RPM_ACTIVE) {
+                       dev_err(dev, "runtime PM trying to activate child device %s but parent (%s) is not active\n",
+                               dev_name(dev),
+                               dev_name(parent));
                        error = -EBUSY;
-               else if (dev->power.runtime_status == RPM_SUSPENDED)
+               } else if (dev->power.runtime_status == RPM_SUSPENDED) {
                        atomic_inc(&parent->power.child_count);
+               }
 
                spin_unlock(&parent->power.lock);