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PM / Runtime: Don't allow to suspend a device with an active child 

When resuming a device in __pm_runtime_set_status(), the prerequisite is
that its parent must already be active, else an error code is returned and
the device's status remains suspended.

When suspending a device there is no similar constraints being validated.
Let's change this to make the behaviour consistent, by not allowing to
suspend a device with an active child, unless it has been explicitly set to
ignore its children.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2016-10-17 20:17:01 +02:00 committed by Rafael J. Wysocki
parent 8812872960
commit a8636c8964
1 changed files with 11 additions and 1 deletions
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12
drivers/base/power/runtime.c
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@ -1028,7 +1028,17 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
goto out_set;
if (status == RPM_SUSPENDED) {
/* It always is possible to set the status to 'suspended'. */
/*
* It is invalid to suspend a device with an active child,
* unless it has been set to ignore its children.
*/
if (!dev->power.ignore_children &&
atomic_read(&dev->power.child_count)) {
dev_err(dev, "runtime PM trying to suspend device but active child\n");
error = -EBUSY;
goto out;
}
if (parent) {
atomic_add_unless(&parent->power.child_count, -1, 0);
notify_parent = !parent->power.ignore_children;