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PM: runtime: Drop runtime PM references to supplier on link removal

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While removing a device link, drop the supplier device's runtime PM
usage counter as many times as needed to drop all of the runtime PM
references to it from the consumer in addition to dropping the
consumer's link count.

Fixes: baa8809f60 ("PM / runtime: Optimize the use of device links")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+
Tested-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki
2020-10-21 21:12:15 +02:00
parent 3cea11cd5e
commit e0e398e204
3 changed files with 24 additions and 7 deletions
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21
drivers/base/power/runtime.c
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@@ -1729,7 +1729,7 @@ void pm_runtime_new_link(struct device *dev)
spin_unlock_irq(&dev->power.lock);
}
void pm_runtime_drop_link(struct device *dev)
static void pm_runtime_drop_link_count(struct device *dev)
{
spin_lock_irq(&dev->power.lock);
WARN_ON(dev->power.links_count == 0);
@@ -1737,6 +1737,25 @@ void pm_runtime_drop_link(struct device *dev)
spin_unlock_irq(&dev->power.lock);
}
/**
* pm_runtime_drop_link - Prepare for device link removal.
* @link: Device link going away.
*
* Drop the link count of the consumer end of @link and decrement the supplier
* device's runtime PM usage counter as many times as needed to drop all of the
* PM runtime reference to it from the consumer.
*/
void pm_runtime_drop_link(struct device_link *link)
{
if (!(link->flags & DL_FLAG_PM_RUNTIME))
return;
pm_runtime_drop_link_count(link->consumer);
while (refcount_dec_not_one(&link->rpm_active))
pm_runtime_put(link->supplier);
}
static bool pm_runtime_need_not_resume(struct device *dev)
{
return atomic_read(&dev->power.usage_count) <= 1 &&