[PATCH v2 2/3] devres: Add devm_is_action_added() helper

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

In some code we would like to know if the action in device managed resources
was added by devm_add_action() family of calls. Introduce a helper for that.

Reviewed-by: Raag Jadav <raag.jadav@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/base/devres.c         | 11 +++++++++++
 include/linux/device/devres.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 93e7779ef21e..7c2babfa9396 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -749,6 +749,17 @@ int __devm_add_action(struct device *dev, void (*action)(void *), void *data, co
 }
 EXPORT_SYMBOL_GPL(__devm_add_action);
 
+bool devm_is_action_added(struct device *dev, void (*action)(void *), void *data)
+{
+	struct action_devres devres = {
+		.data = data,
+		.action = action,
+	};
+
+	return devres_find(dev, devm_action_release, devm_action_match, &devres);
+}
+EXPORT_SYMBOL_GPL(devm_is_action_added);
+
 /**
  * devm_remove_action_nowarn() - removes previously added custom action
  * @dev: Device that owns the action
diff --git a/include/linux/device/devres.h b/include/linux/device/devres.h
index 9cd1787ef28e..ae696d10faff 100644
--- a/include/linux/device/devres.h
+++ b/include/linux/device/devres.h
@@ -165,4 +165,6 @@ static inline int __devm_add_action_or_reset(struct device *dev, void (*action)(
 #define devm_add_action_or_reset(dev, action, data) \
 	__devm_add_action_or_reset(dev, action, data, #action)
 
+bool devm_is_action_added(struct device *dev, void (*action)(void *), void *data);
+
 #endif /* _DEVICE_DEVRES_H_ */
-- 
2.45.1.3035.g276e886db78b