[PATCHv7 03/10] devfreq: event: Add resource-managed function for devfreq-event device
Chanwoo Choi
cw00.choi at samsung.com
Wed Jan 7 15:51:10 PST 2015
This patch add the resource-managed function for devfreq-event device as
following functions. The devm_devfreq_event_add_edev() manages automatically
the memory of devfreq-event device using resource management.
- devm_devfreq_event_add_edev()
- devm_devfreq_event_remove_edev()
Cc: Myungjoo Ham <myungjoo.ham at samsung.com>
Cc: Kyungmin Park <kyungmin.park at samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi at samsung.com>
---
drivers/devfreq/devfreq-event.c | 63 +++++++++++++++++++++++++++++++++++++++++
include/linux/devfreq-event.h | 16 +++++++++++
2 files changed, 79 insertions(+)
diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c
index 64c1764..5301e2b 100644
--- a/drivers/devfreq/devfreq-event.c
+++ b/drivers/devfreq/devfreq-event.c
@@ -451,6 +451,69 @@ int devfreq_event_remove_edev(struct devfreq_event_dev *edev)
}
EXPORT_SYMBOL_GPL(devfreq_event_remove_edev);
+static int devm_devfreq_event_match(struct device *dev, void *res, void *data)
+{
+ struct devfreq_event_dev **r = res;
+
+ if (WARN_ON(!r || !*r))
+ return 0;
+
+ return *r == data;
+}
+
+static void devm_devfreq_event_release(struct device *dev, void *res)
+{
+ devfreq_event_remove_edev(*(struct devfreq_event_dev **)res);
+}
+
+/**
+ * devm_devfreq_event_add_edev() - Resource-managed devfreq_event_add_edev()
+ * @dev : the device owning the devfreq-event device being created
+ * @desc : the devfreq-event device's decriptor which include essential
+ * data for devfreq-event device.
+ *
+ * Note that this function manages automatically the memory of devfreq-event
+ * device using device resource management and simplify the free operation
+ * for memory of devfreq-event device.
+ */
+struct devfreq_event_dev *devm_devfreq_event_add_edev(struct device *dev,
+ struct devfreq_event_desc *desc)
+{
+ struct devfreq_event_dev **ptr, *edev;
+
+ ptr = devres_alloc(devm_devfreq_event_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ edev = devfreq_event_add_edev(dev, desc);
+ if (IS_ERR(edev)) {
+ devres_free(ptr);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ *ptr = edev;
+ devres_add(dev, ptr);
+
+ return edev;
+}
+EXPORT_SYMBOL(devm_devfreq_event_add_edev);
+
+/**
+ * devm_devfreq_event_remove_edev()- Resource-managed devfreq_event_remove_edev()
+ * @dev : the device owning the devfreq-event device being created
+ * @edev : the devfreq-event device
+ *
+ * Note that this function manages automatically the memory of devfreq-event
+ * device using device resource management.
+ */
+void devm_devfreq_event_remove_edev(struct device *dev,
+ struct devfreq_event_dev *edev)
+{
+ WARN_ON(devres_release(dev, devm_devfreq_event_release,
+ devm_devfreq_event_match, edev));
+}
+EXPORT_SYMBOL(devm_devfreq_event_remove_edev);
+
/*
* Device attributes for devfreq-event class.
*/
diff --git a/include/linux/devfreq-event.h b/include/linux/devfreq-event.h
index 13a5703..3c44ad1 100644
--- a/include/linux/devfreq-event.h
+++ b/include/linux/devfreq-event.h
@@ -123,6 +123,10 @@ extern int devfreq_event_get_edev_count(struct device *dev);
extern struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
struct devfreq_event_desc *desc);
extern int devfreq_event_remove_edev(struct devfreq_event_dev *edev);
+extern struct devfreq_event_dev *devm_devfreq_event_add_edev(struct device *dev,
+ struct devfreq_event_desc *desc);
+extern void devm_devfreq_event_remove_edev(struct device *dev,
+ struct devfreq_event_dev *edev);
#else
static inline int devfreq_event_enable_edev(struct devfreq_event_dev *edev)
@@ -184,6 +188,18 @@ static inline int devfreq_event_remove_edev(struct devfreq_event_dev *edev)
{
return -EINVAL;
}
+
+static inline struct devfreq_event_dev *devm_devfreq_event_add_edev(
+ struct device *dev,
+ struct devfreq_event_desc *desc)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline void devm_devfreq_event_remove_edev(struct device *dev,
+ struct devfreq_event_dev *edev)
+{
+}
#endif /* CONFIG_PM_DEVFREQ_EVENT */
#endif /* __LINUX_DEVFREQ_EVENT_H__ */
--
1.8.5.5
More information about the linux-arm-kernel
mailing list