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PM: runtime: Allow unassigned ->runtime_suspend|resume callbacks

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We are currently allowing ->runtime_idle() callbacks to be unassigned
without returning an error code from rpm_idle(). This has been useful to
avoid boilerplate code in drivers. Let's take this approach a step further,
by allowing also unassigned ->runtime_suspend|resume() callbacks.

In this way, a consumer/supplier device link can be used to let a consumer
device be power managed through its supplier device, without requiring
assigned ->runtime_suspend|resume() callbacks for the consumer device, for
example.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2021-06-08 11:02:49 +02:00 committed by Rafael J. Wysocki
parent 5a2bd1b1c6
commit 63d00be693
1 changed files with 3 additions and 5 deletions
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8
drivers/base/power/runtime.c
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@ -345,7 +345,7 @@ static void rpm_suspend_suppliers(struct device *dev)
static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
__releases(&dev->power.lock) __acquires(&dev->power.lock)
{
int retval, idx;
int retval = 0, idx;
bool use_links = dev->power.links_count > 0;
if (dev->power.irq_safe) {
@ -373,7 +373,8 @@ static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
}
}
retval = cb(dev);
if (cb)
retval = cb(dev);
if (dev->power.irq_safe) {
spin_lock(&dev->power.lock);
@ -484,9 +485,6 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
{
int retval;
if (!cb)
return -ENOSYS;
if (dev->power.memalloc_noio) {
unsigned int noio_flag;